It may not be suuuper obscure, but Invisible Inc went under the radar a bit and is really up there for my vote for best game ever

Procedural levels and permadeath in turn-based stealthing your way through “dungeons” that are evil cyberpunk corporate offices and stealing all their shit before all the security comes down on you like a tonne of bricks

The turn based stealth is so damn slick, but I think its real achievement is absolutely nailing the risk/reward curve. The clock is ticking to higher security measures and you want to steal more shit so you overreach and fuck up - you’ve got all the time in the world to think it out, maybe you’re fucked but more often than you think you can let out all the stops and pull off the most ridiculously heroic hail mary to get your people out of there, and it feels so damn good when you do. So many “hard” games with permadeath etc just end up making you super risk averse and slow and it’s super boring, this one actively pushes you to ride right on the edge of catastrophe and I love it. Even better with the expansion pack too