you can play on linux sadly not native but its a work around
1) use the program " Lutris " start it or install it (check the website on how to install it depends on the distro)
2) click on the " + " on top of the window
3) add locally installed game
4) name the game has you wish in this case " Gunsaw Demo "
5) Select Runner to "Wine (Runs Windows games)"
6) go to game options add the folder location with the exe path mine is like this " /home/USER_NAME/.config/itch/apps/gunsaw-demo/GunsawDemo.exe " but for you can be diferent
add prefix architecture to " 64-bit "
7) go to runner options and add " proton 7.0 "(if you have steam installed you can download it or try other proton/wine versions (this was just a fast test to see if it worked))
in case the game cant be started with the error
"expected str, bytes or os.PathLike object, not NoneType"
add this on game options wine prefix " /home/USER_NAME/.wine "
8) start the game in lutris do not start it on itch it will not work
this should make the game run atless i hope this can help you :)