There's a nice game in here somewhere, but it's not much fun in its current state. Primarily because the collision detection is too unforgiving, but also because it has no sound. It really needs sound effects to bring life to the wacky graphics and perhaps a sillyish tune.

Nice game; it combines a plain grid-world with simple single-pattern AI to play like a classic Nintendo title. Reminds me a bit of of Bubble Bobble. A few powerups and a gameplay timer (high scores/fastest times list) could add some variety & replayability.