Hey there,
I enjoy Linux gaming via WINE/Proton, but I often wonder about Linux-native FOSS games. You often see brilliant titles like 0AD and Mindustry mentioned, but there are also some unspoken gems in the “genre” like Minetest and it makes me wonder what other FOSS games are out there, that people just don’t talk about much? I’m looking to discover and play more of these titles.
I spent several years on OpenBSD playing mostly foss games (no WINE support) before I got my steam deck, so I feel fairly qualified with recommending Cataclysm DDA, Xmoto, and Dungeon Crawl Stone Soup. Say goodbye to the next several months of your life. Other cool FOSS games that grabbed me, but not to the same level: Ur Quan Masters (Star Control 2), and endless-sky.