I've played this kind of game back on the Atari ST: http://www.atariuptodate.de/en/2461/bolo (which was quite a hit at that time)
I appreciate the effort of revisiting this idea, but I think there's lots to improve. To start with, the game seems to crash after you lose. Then the resolution should be higher, the control should be less sluggish, control with keyboards should be possible or – alternatively – a free positioning with the mouse (unlimited speed of moving to the left/right). More variety, special bricks etc. can be added. I think, however, without a real innovative new idea, the game will have a hard time to compete. SlyBalto gave some nice suggestions in his comment!
Good luck with further games! :)