


If you force this (linux native, oh the irony) game to run it's Windows variant, by forcing it to use Proton, the game runs flawlessly.
First start, the screen immediately backgrounded. After foregrounding the app, the screen was heavily glitched and unreadable. Starting the game a second time worked immediately, with no artifacts whatsoever.
The native Linux binaries of this game don't work on modern Linux systems (I've made a previous report about that, they exit with exitcode 53 almost immediately). Simply going to "Properties" -> "Compatibility" and enabling "Force the use of a specific Steam Play compatibility tool" and selecting "Proton Experimental" made the game work.

Native Linux executable does not run, exits with exit code 53
I've been trying to get the linux-native executable(s) for this game running on modern Linux (i.e., Linux 6.12.x, Wayland, etc). I've tried both the i386 and x86_64 binaries. In both cases the game crashes immediately. Checking the exit code on console (echo $?) I see that the binary exits with exit code 53.
Running the game with gdb
I see the following:
Program received signal SIGTRAP, Trace/breakpoint trap.
__pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=5, no_tid=no_tid@entry=0) at pthread_kill.c:44
44 return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;

TDP Limit 3W, GPU Clock 200MHz, Half rate shaders
To work you need to either
- Force Proton experimental
- Switch to desktop mode and launch the game from there
Title.
On default Proton the game wouldn't launch at all.
Did not work until trying GE-Proton7-16

The Steam Cloud support advertised by this game is NOT cross-platform. This means that your Linux save data will not be available when running this game with Proton.