Thank you for all the feedback! I agree with everything.
I was hesitant with adding another restart keybind because I didn't want to overcomplicate the controls. I think a rework of the respawn system would be more ideal.
The small tubes would definitely benefit by increasing their diameter to better accommodate the camera and have "less sticky" movement inside.
Levels 4 and 5 were last minute additions and are unfinished because of it. I underestimated just how long creating polished levels is going to take. I'm aware of the strange camera behavior when upside down in the magnetic level. The entire magnet mechanic would need to be polished up, but I didn't want it to go to waste when it was already somewhat usable - just to include a bit more variety.
Thanks again for playing the game and leaving extensive feedback!