Asklemmy

What platform? I can think of multiple must buys, but it really depends on the system.

Voices of the Void.

Oh, wait. It's free right now??? Go get it!

You can't buy them anymore. They're all got delisted from every store by the publisher.

Celeste absolutely! It's difficult but it's really really fun and has a great story. If you ever get super invested, the community is great and the skill ceiling is so high that you can always get better when playing new maps.

RoboCop: Rogue City

Bioshock series

I'm currently addicted to Chained Echoes, a 2D SNES style rpg adventure.

omori

Rain World hands down, such an interesting and challenging game.

Pathologic 2! It's so good! And the next one is coming out next year so it's a great time to become obsessed with Pathologic!

Haven't seen it here yet: Metro 2033 (sequels good too)

I'd also say S.T.A.L.K.E.R for the similar elements. But it's pretty well known and if it interests you, you know why you should be playing it. :p

Metro 2033 wowed me, and I still think of it fondly. Y'see, at the time, everyone was loudly clamoring for "open world this" and "RPG progression system that" and "Every choice matters branching storylines!". Everything had to be marketed as some huge pseudo-endless experience with limitless freedom. Sure, sure, there's a place for that. BUT...

Metro 2033 is a fairly linear post apocalypse shooter based off of a novel of the same name that doesn't overstay its welcome. And know what? It feels like playing through a good book.

You experience this twisted, scary, often beautiful world through Artyom's eyes as he explores hostile tunnels and the inhospitable surface, and along the way you meet a cast of very interesting, very "alive" feeling characters. The various mutant creatures, too, have fascinating behaviors and personalities. Even though many parts are scripted, you still feel a sense of awe with seeing the consistency with how these things behave.

Subterranean tunnels and frozen post-nuke wastelands feel ALIVE when you're checking your map with a lighter, or scrounging for a gas mask after yours cracked, and you cling to the numbered, desperate breaths through your last filter. (I'm being dramatic it rarely gets THAT desperate lol.)

The real beauty of the game, like humanity's remnants, are under the surface. It's subtle. There's a hidden morality system keeping track of how Artyom reacts to the world, and the overall themes and sociology go much further than "war is bad mmkay?". Do you meet brutality with brutality, or do you combat the darkness of this world with understanding and mercy?

Sadly, Metro Last Light carries on with 2033's bad ending as canon. Which makes sense, but 2033's good ending is so GOOD.

They're regularly ridiculously cheap now, and I personally loved the experience.

Also: The best difficulty system I've ever seen in a shooter. It feels like playing on "Ranger Hardcore" is the intended experience. It doesn't go the lazy route of making the player weak and the enemies strong. It goes for realism.

Enemies get smarter but will actually go down in a good hit or two...But careful!...So will you.