Overall an interesting experience! I liked you taked on the theme and the game played pretty well. I played up to the point where I felt like I had a good grasp of all of the mechanics.
Some comment I have:
- Hitting one brick generator is very punishing, perhaps you should've told/taught the played that exploding these does collatoral damage
-It is unclear what the button does where you first start the game. A very small tutorial instructing the player to build some blocks and then press the button would do wonders (think a bit of text at the top of the screen that dissappears once the task has been completed)
-The sfx are great but some music would do wonder.
-I wish the difficulty would ramp up in the form of more balls spawning/ the balls speeding up.
-I really like how you deal with the player dying
It was a neat game though and definitely has room to grow into a really fun game, well done!