Interesting game you have here...I had a bit of difficulty actually learning how to get started. because it doesn't seem like you left any instructions anywhere (for the record, arrows to move, left-click to exit). It can definitely use some work, but I like the concept of it. Very simple, but can make for some intense, moment-to-moment, on-the-spot strategizing, particularly as you increase the number of balls and shoot for the highest perfect score possible.
Kid mode makes for a decent training mode, and the other two are a little hard to tell apart (other than one having a score to aim for and the other making you set your own high score). Increasing the balls number of balls to appear on screen at once was also fun, though if you allow too many on screen at once (we'll say 100+ for new users), it gets to a point where you could easily die right on the onset of the game, before you even know what happened. When the game gets to that point, you may as well not even move the ball and just let it float by itself, since just figuring out where to move the ball before it explodes become difficult. You'll die right off the bat a lot. Once in a while you'll last longer than a few seconds, just to die a few seconds later.
The music and art is simple, but at least functioning. Some may think it's boring and repetitive, though. Overall, it's a good start. Keep it up.