At some point, probably after my steam deck is fixed, I'm gonna have to start Psychonauts 1. It's been sitting in my steam library for a while and I'm positive a steam deck would be able to play through it just fine, and better than both my desktop and laptop.
I completed Psychonauts recently on my PC. There's a Linux native version as well, and both it and the Windows+proton versions seemed to work... adequately. It's pretty janky, which I mainly attribute to it being an old PC game.