Wow! Very cool! I really enjoyed this game; it's really up my alley. I got to the 6 coin area before I got hopelessly stuck. Some of the jump puzzles are quite tough! At times I felt like I was solving it in some unintended way by abusing screen transitions to refill energy (like getting the 5th energy in the green area; I came from the room on the left by coming from below).
I might come back and try to complete it some time, but I worry about wandering around aimlessly. Also I found a way to get stuck in the 6 coin area right off the bat. Was I supposed to only have 5 max energy in there?