Concept: it's simple but it works well with the theme.
Gameplay: simple but fun, it doesn't drag on and is well balanced. Very polished gameplay loop, I like it a lot. AI code does knock a bit off my rating though.
Art: simple but nicely polished and fits the game really well.
Audio: the sfx are good and very fitting for the gameplay and the artsyle. I kinda missed a short intense background track to give a bit more gamefeel though.
It's a pretty good submission overall, simple but very well polished. Nicely done all round!