Fun: This was fun! I had a moment playing this game where I thought, "okay I think I've seen everything this game has to offer, unless the next level has something cool" and then it did and it was awesome. I think it can feel a bit slow at times, however.
Innovation: I thought the way that the player gains a new weapon as the enemies get stronger was cool and interesting.
Art: I found the art to be cute and it did all it needed to
Sound: I thought the sound effects were a bit loud, but other than that, they were good!
Theme: Fits the theme, however I wish you incorporated the shell more into the gameplay more than it just being a narrative element