I love roguelike games because you have to invest skill to win and not (just) time. Here are my favourite ones (in no particular order):
- Tales of Maj'Eyal (https://te4.org/)
- Caves of Qud (https://www.cavesofqud.com/)
- Cogmind (https://www.gridsagegames.com/cogmind/)
- Jupiter Hell (https://jupiterhell.com/)
- Dungeon of the Endless (https://www.amplitude-studios.com/#GamesDungeonOfTheEndless)
- FTL (https://subsetgames.com/ftl.html)
- Into the Breach (https://subsetgames.com/itb.html)
- Rift Wizard (http://www.dylanwhitegames.com/riftwizard/)