Adictive
Good game, very adictive!
When he shot the blue ball i kept circling for quite a while with the ball after me, maybe if you increase its speed it has more chance to collapse against the walls (since the monster won't move when the blue ball is active, its very easy.
Also, work on the graphics a bit. Now it's fun to play, you could also make it fun to watch the monster (it's more an alien now)
Keep up the good work!