Pretty Good
The music didn't seem to fit what was going on a lot of the time (despite being called 8-Bit Bossbattle). Also, the animation seemed pretty basic -- the climactic moments reminded me of someone playing with action figures.
Aside from that, it was alright. There wasn't much of a plot to speak of, and I didn't get why the princess didn't need saving, but it was short enough that not getting it didn't really bother me. A fairly solid first submission.