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.
Simon Tatham’s Puzzles, particularly Net on a very large board with wrapping.
I also like good ol’ Stepmania (or the more recent ITGmania fork), but I’m pretty bad at it.