Nice game. I found that it was very hard to go up slopes/angles and the music was a bit loud. Another piece of feedback was that I initially expected to have to press spacebar to start the game, but instead this had to be clicked.
I quite liked the level design in the second one that introduces the new enemy and box type in a way that teaches you how to use them as well. Very useful.
Lastly in midair if you run of a ledge, jumping is possible. So sometimes running at full ninja-cato speed and jumping during your descent allows for quite a few skips.
Nice game. Fun art. Neat design.