Well I'm a big fan of puzzle games, the best of which imo are "superliminal", "baba is you", "Patrick's parabox", "gentoo rescue" and "can of wormholes". I also loved "poco", a short free 2.5d point and click adventure where you play as a tiny clown. However the game I recommend you play the most is "babbdi", a short free surreal dystopian walking simulator about trying to leave the town of babbdi.