Woah, this is really high quality for just 72 hours! It feels like a very complete game with stuff like the title screen and smooth transitions between levels. The art is all high quality and well animated, plus it fits the system limitations well. The sound effects and music are also great. It's particularly impressive how there are different music tracks every so often when one would probably have been acceptable.
I like the unconventional movement style of the gameplay. It makes the game feel fresh and it's fun zipping around the place. I also enjoy how new obstacles and mechanics are introduced every so often to keep mixing things up. I sort of feel like something is missing though. The game is quite easy and the levels are very open so you don't have to put much thought into the movement. If may have been more interesting if there was some of limit to how much you can throw so you would be forced to carefully consider each move.