That's good to hear! I'm glad it runs well on proton, I never got a chance to test that.
The timing window for shooting on the beat atm is very large, as the settings panel and latency calibration had to be cut last minute due to some technical issues, but the general idea is you gotta time your inputs to line up with the music, or they become less effective/may not register. Timing your pistol shots with the rhythm for example, and how the shotgun has a two-beat cycle of shooting and then pumping. The large timing window means its pretty hard to miss though.
Thank you for playing, and for the awesome praise!