I really like this. Pong type games are a current fascination for me so I'm really happy to see a game that takes the idea and changes just enough to make it absurdly fun. I don't think this game _needs_ anything because it's pretty well perfectly formed and it fits the 20 second format very nicely because you kept it simple. If someone put a gun to my head and forced me to suggest something, it would be a some light but fast paced background music to help add a little pressure.