Someday I will finish my replay of Psychonauts. (I was trying for 100% completion like some kind of idiot, which caused me to get sick of figments and drop the game for a while, multiple times. Maybe I'll give up on that.)
The native Linux port works pretty well, once you fix the gamepad controls. I've noticed a few bugs though, and several of them fall under the category of... graphical effects going the wrong way...? I don't know how else to describe it, but pic related. I assume there's supposed to be liquid dripping DOWN from these things, not UP. Elsewhere in this level, I think the liquid sprite coming out of a fountain is similarly upside-down.
Both of these bugs are probably related to this one (in which the graphical representation of a boss's attack goes the wrong direction):
https://bugzilla.icculus.org/show_bug.cgi?id=5646
It's a shame that it was apparently never fixed.