I’ve been recently been thinking about Arkane Studio’s Prey which is a immersive sim, with a pretty good rogue like dlc, that probably has one of the strongest hooks of any game I’ve played. If you liked Halflife, System Shock, or Deus Ex it’s definitely worth a play.
Are there any titles that might not have been commercially successful that you feel everyone should give a shot?
A Robot Named Fight! https://www.arobotnamedfight.com/
“A Robot Named Fight is a Metroidvania roguelike focused on exploration and item collection. Explore a different, procedurally-generated labyrinth each time you play and discover randomized power-ups to traverse obstacles, find secrets and explode meat beasts.”
It’s such a good game, almost everything is perfect IMO, I have over 200 hours in it and still go back to it every now and then. The lone developer also made the source code public a while ago, so there are mods, forks, spinoffs etc. being worked on.