This is sooo good! I love how the dojo looks. It has a simple but effective color scheme, and such an interesting and varied set of patterns. The controls are smooth and the level design is excellent--I felt like a 10-year-old playing Mega Man 2 for the first time. The 5 health points are suitably forgiving, given all the puzzles you have to solve. Also, the old teacher's jokes are pretty funny.
My one complaint is that it is possible to "soft lock" the game by pushing a box into the wrong place. This actually happened to me a few times, and it is annoying because there is no way to proceed unless you can get to some spikes and kill yourself.
Also, I encountered a bug on the last level. I took a hit that should have killed me, but the game got stuck instead, so I didn't get to see the ending. :(