Gaming

Baba Is You, Into The Breach, Ultima VII (with Exult)

Maybe a game like terraria? It's a native linux game and hella fun!

Or if you want a more chill game maybe something like Gris? It has a gold rating on ProtonDB so should work fine. Gives u the feels too which is a bonus.

Stronghold Crusaders, or Command and Conquer.

Nostalgic childhood games.

mindustry is amazing. https://mindustrygame.github.io/ you will lose days of your life playing this game.

Oceanhorn

caves of qud is quite good, its tile based roguelike.

Maybe I haven't scrolled far enough, but haven't seen anyone recommending Persona, if so I definitely recommend it, in this case, Persona 4, which I played.

There's also Fable Anniversary, the classic Xbox exclusive RPG, both games are also Deck Verified.

If you like roguelikes I'd recommend Dungeon Crawl Stone Soup.

Nuclear Throne. It's a fun Roguelike dungeon crawler. A run from beginning to "end" (last level before looping) can take 15min and I've spent 100s of hours playing over the years.There' are so many characters you can choose to play, each with its own unique special ability.

Cave Story is good / hectic / hard platformer. I might be wrong but I think it was made for Linux first

Tales of Maj'eyal is my go-to roguelike when I have some down time on laptop.

If you like text-based adventure games, check out ifdb.org for a massive store of free and abandoned text-based games. You can play in-browser or on any OS with a native client, Linux and Android included

Backpack hero is very cute and fun, and runs very well through proton.

Bloons TD6 is pretty fun and light.