Fun!

Graphics: The graphics needed a little bit of improvement to draw the player in. And just to look nice.

Sound: I didn't really hear any sound to the game, but what could you have put in. Maybe some bg music couldn't hurt. But that can be annoying.

Gameplay: The gameplay was great, fast, and fun. Although could have used more levels, and perhaps a campaign mode?

Story: No story here, but doesn't really need one.

Interface: A great interface, but maybe more objects could have been used. But walls and collision was prefect.

Overall: [D] As a hole it's quite fun, try if you got the time! Of course you do need two players though. With enough improvement can be a great game, just needs a little more to it is all.