very well done
This one, of all 3, I would have to say is the best even if the levels from 4 and on are hard. I seem to be stuck on Level 13, and i glitched it by teleporting on top of spikes. I couldn't jump, but I could move around and I had -15 health without exploding.
By that point, I just quit and saved.
After I complete the game, I will try to tackle the secret levels.