Mouse clicks and scroll wheel make the camera spin around ~1/4 turn per click making it impossible to interact with objects. Rebinding "use left/right hand" to other keys (like z/x) gets around that, but you still have to scroll to change blueprints as far as I know. On Proton 4.2-9 the mouse will occasionally screw up and not be properly captured by the game and will cause you to go spinning even at the slightest movement (more rapidly the further your mouse is from center) but 4.11-5 doesn't seem to have this issue. Both have the spinning when clicking/scrolling however. Otherwise, game runs as good as on Windows. It was Platinum before the latest update which I think changed versions of Unity. Right now it perfectly fits the Bronze description "has issues preventing from playing comfortably" as it definitely runs well except for the discomfort of spinning when you use the scroll wheel or have to rebind mouse clicks to keyboard keys.