if it doesn't bother you, can you tell me what did you do? like did you use the itch.io build add the .exe inside the folder to steam, used proton experimental and it worked?
Yes thats exactly what I did. At first I tried to run it with default proton but that didn’t work so after it failed I switched to proton experimental it worked no problems. I added the folder with the exe and other files to my documents folder and added the exe within the folder to steam as a non steam game