It is a game lacking a few things; but I took this game as a good stress-reliever. It was simple, with not much point besides to pop the balloons before you lose. Which is pretty basic.
For improvements; as stated by others, the game would be more enjoyable if you had power-up's, and possibly some music. Different levels would also be a plus.
Above all its an alright game to kill a minute or two, or if you're into getting a high-score and then trying to beat it.
But keep at it! I'm sure the next one will be an improvement.