Really interesting idea! I played on my Android phone and it worked really well! I got down to B200, though I have no idea if that's decent or not!? I would say that the ball collection and firing is probably the weakest part of the game - I couldn't figure out how to do it initially! You might want to hold off starting the timer until the player has dropped a couple of rows down so that they get the idea first? Also, I couldn't figure out the logic behind the timer - it just seemed to do whatever it wanted!