make sure you use heroic 2.9.2, use latest Wine-GE-Proton, try on desktop mode first, the game should just work out of the box on the steam deck (I tried it last night without any tweaking)
do you have the game installed in your internal drive or an SD card? not sure what to suggest but I've seen some games with issues running from an SD card in the past I think, I tested on my steam deck and the game needs no tweaks to work but I have in instaleld in the internal drive
The game doesn't start, I checked various settings. I downloaded the game on Steam as a test and the game works properly. There is some problem launching EPIC through Herois I installed the game on internal and external memory.