Pretty, but tired
For one, the game is certainly beautiful - graphically and stylisically.
But as much as I LOVE pressing A repeatedly, it got boring really quick. Fortunately, the game was over pretty quick, too.
Advice: make more interesting levels and enemies; make some that actually move fast enough that hitting them is a challenge, or wearing suits of armor where you have to wait for their weak spot to be exposed. Make a level maybe on a bridge with holes in it that you have to avoid. Put some puzzles in. Add a boss fight (maybe one that uses all of the above!). Anything to break up the A-A-A-A.