What distro are you using? For me on CachyOS (based on Arch), the Linux version works. Minor issues are:
- When using a controller Chromium does not recognize the brand of, the d-pad does not work (so you have to use the stick) and the buttons are mixed up (Cross is displayed as Circle, Square is displayed as Cross, Circle is displayed as Square).
- It doesn't remember the fullscreen setting, and like other Chromium-based apps, it asks for my login password on startup. I fixed both these issues by launching the game with:
gamescope -w [your horizontal resolution] -h [your vertical resolution] -f -- ~/.config/itch/apps/somnabuster2024/linux64/somnaBuster --password-store=basic
- The mouse cursor does not disappear, you have to move it to the corner.