If you run it on the steamdeck, you can just download the Linux version, add it to Steam, then manually tell it to run with proton. I didn’t know this was possible until yesterday, but it will not run on steamdeck without proton due to missing dependencies that are included with proton.
Kb+M controls are awesome, especially for diagonal movement that lets you run at a steady 141% speed - it's also way easier to land your shots while aiming.