When I started this game, I was like "Oh geez, I'm controlling with the arrow keys? This is gonna be a mess." But I was pleasantly surprised as the ball actually controlled really really nicely!
Another fear I had going into this was that it would get too hectic and unfair towards the end, but you also proved my cynicism wrong in that regard. The bonuses you get upon leveling up are really helpful and keeps the game fair going all the way to the end.
Also, the music you used was perfect for this game.
I was slightly disappointed at the fact that I couldn't keep going after getting to level 10. Having the level cap end there and having a survival would have been fun.