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Menus may glitch with some versions of Proton, especially when customizing the character or when setting up a custom scenario. The game itself works perfectly.
The huge custom mouse cursor in the menus is placed incorrectly, making it difficult to click on menu options, especially when customizing the character. You need to click by the midpoint of the cursor image, not by the tip of the pen. To help aiming the cursor, first hover over the color palette and look at which item the game tells you is currently under the cursor. Then try to hit the option you want. All Proton versions I've tried (7.x, 8.x, GE 7.x, GE 8.x) behave the same in this regard.
Scaling of character textures in this game is buggy (from what I hear, on Windows too). Set the texture quality to Epic to avoid visible black seams at the shoulders of the player character's skin texture. Effects also need to be set to High or better to get visual feedback when the character becomes dizzy or exhausted. The 3070 Ti laptop GPU is enough to run with everything set to Epic.
The bugs in the previous versions of proton have been fixed
