Thanks for the game recommendation! I just had a lot of fun playing GL TRON on my Android 11 (crDroid 7.38) phone. I had to map the ‘menu’ function to the nav buttons to access the settings since modern Android doesn’t have a dedicated menu button anymore, but it runs great!
Simon Tatham’s Portable Puzzle Collection includes a game very similar to nonocross, as well as about 40 other puzzle games you might also like.
I ran Debian Sid on my primary computer for a few years, and it broke hard several times, requiring things like booting into recovery and package dependency untangling to fix. It was years ago, so they might have better safeguards against that now, but there’s no way I’d recommend that to a new Linux Desktop user.
Andor’s Trail - RPG where you search for your missing brother. Still under development, but there’s a lot of content. It’s convenient to fill a few spare minutes or waste hours.