Level Up! Meh.
I got to around 99% and it froze. I was next to the big computer (In the sacred ground, I think?) and I jumped to leave the area and the game froze. I couldn't be bothered playing again, as I had to start from the very start. Maybe implement a save/load system? Any reason that wouldn't work? Also, do you have to finish the game to get the medals? I didn't get any of the medals I should have. Also it's slightly annoying if you try to jump a specific distance and your run or jump skill level up mid-jump/run-up, you go further than you meant to and fall to a different area or something, but not a huge problem. Awesome game, well done. =)