You're welcome, I really enjoyed your game so wanted to give a bit longer feedback! :)
Yeah I only used slow powerup on the last one where the rotating blades were just way too fast. I thought that otherwise they made the game harder :D
I agree with your comment on #2 that I like the fact that it is 3D and not just basic 2D, but just little fine tuning that makes it a bit clearer for the player, since it was quite frustrating after multiple tries and then hitting something you thought was not on the same level, or maybe I just can't tell things apart :D haha.