Half Life Alyx, Lone Echo, and Asgard's Wrath are all incredible experiences that actually feel like "real games" that made meaningful and justifiable use of VR.
Beat Saber and Robo Recall get honorable mentions from me as well because while neither is groundbreaking, both execute their particular niche more or less perfectly.
Browsing various VR software storefronts now you find basically nothing like any of the above. Everything seems to be trying to mimic the mobile game "quick distraction" approach and shovel out as much garbage as possible rather than creating anything engaging. For anyone who believes that VR has genuine potential for exciting new experiences, as I do, it's incredibly disheartening.
It depends on the size of the opening. If it's small that's no problem. You could block a 1 inch pipe at 10psi with your bare hand and be largely fine. It's a little less than 10 pounds of force assuming a round opening.
The problem is that the total force scales geometrically with the size of the opening. Make it two feet wide at the same 10psi and now you've got about 4500 pounds of force trying to push you though that opening should you find yourself in the unfortunate situation that it's been completely blocked by your body.