At the time of writing, the game's native version crashes at startup. Latest version of Proton will show 3 dialogues of errors in sequence at startup, once the errors are closed the game will start normally. Another issue is that hitting the "Quit" option in the menu doesn't quit the game at all, I had to force kill it every time. As for the inputs: my steam controller wasn't recognized properly and kept the Desktop configuration instead the chosen configuration for the game. Achievements don't work. Other than these issues I was able to finish the game.