Thank you for the screenshot!
There’s a thread on Steam mentioning that the game doesn’t run on certain Proton versions on Steam Deck:
https://steamcommunity.com/app/2721890/discussions/0/594025265594630563/
We’re currently investigating the issue, but since it may be related to the game engine I’m using, there’s a chance it might not be fully fixable.
Thank you for your understanding.