Be sure you have proton experimental installed in steam and just run LinuxStart.sh it will just boot the game but you can also just use LinuxStartGamescope.sh and it will launch it in a gamescope window fit to your screen
got it to work thanks for the help did just have to use the linuxstart.sh. Also my fault when i got the steam deck i didn't update to newest update witch could of also caused the game to not load and stay on black screen. After i updated the deck the game launched with no issues.
