Pretty cool idea BeatSaber + Shooter, but the gameplay even at easy is quite hard. Basely because
1. The "bullets" have gravity so it is hard to land a hit while needing to dodge walls. Other than that, these are the other kind of problems.
2. The crouch mechanic is quite cool not gonna lie, but the camera feels like it doesn't change
3. The audio. The audio options are very limited, when I play songs I mostly hear the gun just blast and the songs feel weird because of stereo, maybe add more option settings?
And 4. when on easy most of the blue boxes are right and red ones are at the left and the mouse is completely different. Maybe add a use button also on controls? or at least a way to change the blue and red balls without having to choose songs weirdly.

Those are only the negatives there are a lot of things that change the whole perspective of the game, but I just wanted to give my feedback and things that might troubled me, but don't worry. Keep up the good work and ideas, I wish you the best for later on updates and games.