It's a good game but the challenges are too hard as they rely on the sole fact that you control the bots. the controls are not sophisticated enough and the AI is not good enough for these types of challenges. bad move.
Good job!
suggestions:
-lives
-different kinds of arrows (a big one that goes slow, one that travels in loops...)
-powerups (bounce off of sides, randomly kill an arrow, make a clone that arrows sometimes attack)