Gunfire Reborn: an FPS roguelike that sadly needs to be played with other people. I've only played it a bit, but I've enjoyed it every time.
Risk of Rain 2: a TPS roguelike that works well single player, and has quite a few methods of mitigating RNG. TONS of stuff to unlock, if you enjoy that. Weirdly the DLC makes it worse in my opinion. Epilepsy warning on long runs.
Barotrauma: pilot a submarine around the seas of Europa with a group of friends, fending off underwater aliens and assisting the clowns in their sinister agenda. Again, kind of requires other people.
Inscryption: a roguelike "deckbuilder" card game that's pretty simple but enjoyable.
Mount and Blade Bannerlord (or Warband): a eurojank (technically turkjank?) game where you play a random person in not!Europe who decides that they want to be a feudal lord and gradually builds up their skills, forces, and retinue before moving into the late game and either becoming a noble in an existing kingdom of starting their own. Very fun head-empty third person (and optional first person) combat where hundreds of NPC soldiers fight while you ride around on horseback lancing fools. Can be pretty grindy but you can just cheat to skip a lot of it if it bothers you. Bannerlord is the newer one and looks quite a bit better (though not great), but it doesn't have much in the way of mods yet. Warband has a lot of total conversion mods that add quite a bit of variety, but looks extremely bad, even for a game from 2010.
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