Clever concept. I disagree with GreenClovers about the first stage timing; that wasn't too bad, but I did have an issue with getting off of the door after it shut due to a slight difference between the door level and the rest of the floor. I eventually got stuck at room 13, though, because it seemed like I couldn't make it to the bottom no matter what combinations of arrows I tried. The brick didn't speed up with 3 arrows on the mouse compared to 2 arrows, and neither a single nor a double-height jump got my arc in such a position that I could clear that many spikes.