Hey! The game is very nice and got a lot of potential! I like the overall concept of the game but there are a few things that can be improved:
For instance I would like to see diffrent colors of the sqaures based on the value they have. So the player can easily see what are the "hard" sqaures.
Also I kind of didn't understand how often the ball bounces around until it stopped. And I kind of wished that a square hit increased the possible bounces.
The visuals can be improved as well.
The upgrade system is very nice! This shall be a positive comment, I really liked the game!
So, keep it up!