Sounds like Steam and Proton may be broken. do sudo apt purge steam
and then delete all your Proton prefixes in I think its ~/.steam/steam/steamapps/compatdata
(the folders will all be game ID numbers) then reinstall Steam and try again. I’m running the game with the launcher on Pop!_OS 22.04 which is Ubuntu based and have no problems. However I set in the launcher to use Vulkan instead of DirectX
Pokémon Blue on a used Gameboy color when I was like 8. All downhill from there.