Humble Bundle have just put up The Humble Sweet Farm Bundle and there's multiple lovely Linux games included.
If you only go for the smallest tier at $1 you get:
- Niche - a genetics survival game - Linux supported
- Evergarden - Linux supported
- MagiCat - Works fine in Steam Play Proton.
The higher tier where you need to beat the average payment has:
- Equilinox - Linux supported
- Ultimate Chicken Horse - Linux supported
- Samorost 3 - Runs reasonably well in Steam Play Proton
For the final tier at $10 you will get:
- Stardew Valley - Linux supported
Overall, a pretty good deal actually. I only recently (as in the last few days) tried Ultimate Chicken Horse for the first time myself with my son and it was a massive amount of fun learning it together. A very silly game. I'm also a huge fan of Stardew Valley, so that's an easy recommendation.
Check out the bundle here if you're interested. The bundle ends on February 4 at 7PM UTC.