Sky Beneath is a clever gravity puzzle game where you can control which way gravity aims for your character.
Play as Cassie who is about to test an experimental gravity suit. Rotate the world around her to solve physics puzzles and find you way through the space station...

https://store.steampowered.com/app/1313110/Sky_Beneath/

Proton handled the Sky Beneath Demo without any serious issues. I was able to keep all the settings on high and all the Unreal Engine features were beautiful!

Specs:
Mint 20.1 64-bit
GeForce GTX 1060
Nvidia 460
Proton 6.3-3