This one isn't super new, but Druidstone. It's a story based tactics game with some RPG elements and it's just excellently done. I've never heard anyone else mention it and I think more people should know about it.

I always like to give a mention to Your Spider. There are very few reviews (one of which are mine), but the game definitely deserves more attention.

Avorion - In which you command and build a spaceship designed by yourself (or others on the internet). Soon you have AIs you command and space stations you own. The game allows you to lean as much or as little as you want into the fleet command and economy aspects. If you want, you can just pilot one big-ass ship and do it all alone.

Tactical Breach Wizards

It's made by the Developer who made Gunpoint and Heat Signature (also amazing games if you somehow haven't heard of them BTW).

It's a turn based tactics/puzzle game where you command a squad of wizards with different magical abilities to dispatch a room full of enemies. A bit like Into the Breach but hand crafted scenarios, not procedurally generated.

It also has a fun story, character customisation, and ability unlocks. Almost every scenario has a bunch of optional extra goals, so you decide how hard you want to wreck your brain. Highly recommend it!

Edit: It seems people are aware of this one, I really thought it was a bit niche.

Evoland 2

Evoland 2 is an unique RPG, with its graphic style and gameplay changing as you progress through a deep storyline based on time travel.

Sanctum (and its sequel Sanctum 2)

It’s a tower defense where you also have guns and go fight alongside your towers as a first person shooter.

Both Sanctum and Sanctum 2 are worth playing and have slightly different vibes. Sanctum 1 is simpler while Sanctum 2 has more complex build crafting. Also Sanctum uses a square grid while Sanctum 2 uses a hexagonal grid, and Sanctum 2 has some tweaked enemy mechanics, including enemies that target destroy the towers or killing the players over just going for the core. I think Sanctum 2 tries to make the player feel more important instead of the towers being the main focus.

CrossCode, great characters and great story. Really good game.

Martha Is Dead is a grim psychological triller about twin sisters, set in Italy at the end of WW2. It's not about war, however. This game left me with deep emotions no other game could do. Heed the warnings given by authors, though. It may come too disturbing to some people.

I don't have any suggestions but I do like this prompt and I see a lot of games I've never heard of

Sproggiwood

Rouge like turn based dungeon crawler. Certainly not new by any means, but still a pretty decent little dungeon crawler. The art is cute and the game is pretty simple to pick up, which makes it perfect for more casual play. That said if you're a completionist, it can get a bit repetitive, but nothing too hair-pulling. Probably not worth the full sticker price, but historic sales have knocked it down to $1.49, which is a nice balance between cheap and fun (took me about 28 hours to 100%).

I think this is the only thread where I actually haven't seen any of the games before.

Another game I enjoyed was The Eternal Castle (remastered). It's a remake of a game from 1987. The animation is great and the visual style is really cool.

Return Fire was a head-to-head military shooter, with a choice of four different vehicles of destruction, and is played split-screen on PC with one keyboard. I think I only ever had the demo but it was fantastic.

Pioneer is a great remake of the original Elite Space Sim.
It simulates the entire galaxy (core systems are hand-built, everything else procedurally generated), allows landing on planets, trading, combat, etc.
It features the original game's Newtonian physics, so actually arriving safely at your destination is a challenge in itself, similar to flying in Kerbal Space Program. But the HUD gives you all the info you need for that.

Oh, and it's fully open source and moddable.

Knights Within

Solo indie dev mashup of Risk of Rain, Helldivers, Vermintide, etc with its own soul and style of knights with guns. Dev is very active in the discord and takes feedback and actively plays with the small community the game has garnered.

I played the demo on a whim during a next fest expecting a janky joke of a game to laugh at but a decent and fun game caught me by surprise. It’s been improved and updated quite a bit since then.

Vintage Story

I've always heard it described as Minecraft meets Primitive Technology. I would say that is quite accurate. Maybe some (optional) Don't Starve like elements where you have to worry about the temporal rift (sort of like insanity) and drifters (largely at night).

Technology progression is much slower than Minecraft. Also much more involved. Want a stone axe? You have to place a stone on the ground and use another stone to knap it into shape first. Make an iron shovel? You have to heat up the ingot first and then beat it into shape on an anvil. If you are too slow and it cools down you have to heat it up again.

Farming has 3 nutrient groups, so fertilizers and crop rotation is important.

Leather making is a multi step process of soaking hides in various liquids.

It has a built in and very extensive guide/wiki. It also has a native Linux build.

Crab Champions is a fast paced PvE shooter with roguelike elements. You basically are a crab and fight through multiple waves of enimies. You collect loot to become stronger, and there are fun boss fights. It supports co-op multiplayer, and is made by a single indie developer.

https://store.steampowered.com/app/774801/Crab_Champions/

Linux compatibility is great: https://www.protondb.com/app/774801

From the depths for me is a vehicle building game that's targeted to whoever likes tuning little systems. Haven't seen anyone know of it besides in the community itself. It's a bit like toying around with Lego technic. There's also quite a few more obscure versions of it, but I put this one out because I like it best.

Space Station 14!

We Who Are About To Die

https://store.steampowered.com/app/973230/We_Who_Are_About_To_Die/

Physics based Gladiator roguelike. Work your way up, start fighting with boards dressed in rags in city crossroads for the amusement of peasants, and end a God of Blood fighting in gold in the Coliseum!

Or die along the way. You'll die a lot along the way :)

Turing Complete

It is a game about building functional computer by combining logic gates. Game arranged in series of small puzzles to make it digestible for people without electric engineering degree like me. You slowly build new components, so you can use them later as higher level abstraction until you get to the point of having to program your own computer to solve further puzzles. If you curious how computers work, this game is a gem.

Chex quest. I got this game in a cereal box back in 1996. It defined my childhood.

Now they have an HD version on steam. 10/10 good times.

https://www.chexmix.com/chexquest/

Iron Lung. Everyone is gone. Every star, every planet and every moon. The only people left are those who were on spaceships and stations. With one exception: A moon is found, glowing in the light of a star that doesn’t exist and filled with an ocean of blood. Desperate for answers, the new makeshift government sends prisoners in submarines deep into this ocean with a simple task: make it to a hand full of coordinates, take the pictures and make it out alive. Did I mention it’s an ocean of human blood?

This game fucked me up that one night I played it alone. And no, it won’t take you longer. The dev literally says so in the description. About an hour. But it’s cheap and takes you on a crazy ride. By David Szymanski, the mad genius behind Dusk.

Uplink

A classic from Introversion. It's a bit older so it's gotten over the review threshold by now, but I'd wager it's relatively unknown.

Pizza Tower is a love letter to the Wario Land series, and from my experience, is a drug trip and a half for the sheer absurdity of the game. If you do pick this up, I recomend going in blind :3

Eternum (warning: NSFW) is an adult visual novel that keeps touching me with every new update. It's completely free, and I can't help but think of the creator as a master of the genre.

The characters are all well written and (those who are meant to be) lovable. The story is interesting, compelling even, and the humor is often hilarious. When you go to the website, you might think "Porn game!!!", and not be entirely wrong, but Eternum is so much more. It's a story about love, friendship, and a mystery.

Setting: Orion moves back to the USA after a long time. In recent years, a video game called eternum has been gaining traction, that allows going into virtual worlds, think full dive VR like in Sword Art Online. I'd say about 60% of the story happens IRL.

I can only recommend this masterpiece of a visual novel.

VoxeLibre, what started out as a Minecraft clone is now trying to go it's own way. Does what it says on the tin. Being not quite MC gives it something fresh, yet familiar imo.

Taipan!

A naval trade game about 1800's China from the Apple II. You won't believe it till it happens but I'll become addicted.

Hoplite (puzzley turn-based mobile roguelike). Here's a review I found: https://toucharcade.com/2014/01/08/hoplite-review/

I don't like mobile games, but this one is really elegant. It respects you as a customer, unlike a lot of mobile games.

Haven't played in a while, but I really enjoyed it a few years ago.

Severed Steel is a single-player FPS featuring a fluid stunt system, destructible voxel environments, loads of bullet time, and a unique one-armed protagonist. It's you, your trigger finger, and a steel-toed boot against a superstructure full of bad guys. Chain together wall runs, dives, flips, and slides to take every last enemy down.

SteamDB | ProtonDB

Rabbit and Steel - Cross between a bullet hell and roguelite with raid style gameplay. Requires very close co-ordination with your team to survive (up to 4 player co-op). Punishing but rewarding.

Hidden and Dangerous

Only H&D2 is on steam

The original was fantastic and v2 built on that. Fantastic 3rd person WW2 tactical shooter. Haven't seen anything like it in over 20 years since.

Veloren

Veloren is an action-adventure role-playing game set in a vast fantasy world.

https://veloren.net/