Great game, with room for improvement
Obviously the people that said it was just alright didn't play it long enough. I personally liked it alot but there are things that you could do to make it even better! I suggest that for the sound, you make a code that says only one instance of that sound is to be played at one time (like with the bubble collecting sound). For the game you MIGHT want to make it harder earlier on in the game. Or add difficulties because it was a bit easy. The variation of enemies and such was nice but could possibly be expanded on (I loved the huge bubble bank!).
I believe that if you seriously put some more polish into this and make it the best it could be then you could convince Microsoft to put this on XBL. Great game! :D