I really appreciate the polish and the depth of content. I finished at 221 deaths (on a trackpad, I guess this makes the game harder) and had a lot of difficult but fun practice! I don't have much experience with shooters, but some levels clearly remind me of those grinding moments in platformers and rhythm games. I find such grinding very enjoyable in moderate amounts, which this game succeeded well in providing.
Sometimes I feel that I'm clearing a level by luck rather than practice or strategy, probably due to the fast pace and the tight timing window, which to me was a bit discouraging. I'm particularly curious about the intended solution of the level in the third screenshot (the one with three layers of glass).