I love Endless Sky, it’s honestly one of my favorite games! I have a pack of cool SciFi art that I found on Nexus and I’ve been slowly replacing the stock photos for my personal game. I’m also a sucker for TeeWorlds, it is delightfully infuriating and hillarious to play. I know that’s baby’s first FOSS games but I’m new to open source games. That’s why I want to hear your recommendations and see what are some other good ones out there.
The game that I probably go back to the most frequently is Cataclysm: Dark Days Ahead. While it looks like any other roguelike on one level, it has a bunch of different interacting systems, story elements scattered around (if you only find one cataclysm, then you’re not looking hard enough), and has a debugging system that (if you’re not interested in the action-oriented aspects) can be used to cheat and turn the game into exploring the randomly generated world.