okay, so it's a Breakout/Arkanoid clone, but instead of being solid blocks we've got transparent squares, occasionally giant triangles, a few rather obnoxious obstacles (red X blocks, freeze rays, clock-killing beams, and even timed block shields), and one whopper of a boss in campaign mode.
well, while i do appreciate knowing how many hits each block does have left, i feel the multiplier on the ball speeds it up way to fast. secondly, i noted that when i finished a Quick Game, it automatically unlocked all of the levels in Campaign Mode. if this was purposeful, then go right ahead, but i do find it rather strange. next, although i think i perceive the function Zen Mode, i ultimately fail to see its usefulness in the grand scheme of the game.
as you may well already know, the game is quite buggy: coming back from the game screen to the menu screen or the in-between menus, i often find that the buttons have lost letters. sometimes the buttons have disappeared entirely. i did refresh, close, restart, etc and come back, but problems did seem to persist. sometimes the game itself had forgotten my progress: not sure what that was about either. that's in addition to the ball often getting stuck in between blocks in the playing field (probably the most common error).
also, it kinda detracts from the experience when you also seem to only have half the playing field, but in reality, the ball is stuck bouncing "above" the playing field like it does in that one campaign stage.
lastly, not sure why you decided to make all of the medals secret medals. obviously some of them are going to be stage medals, score related medals, star related medals, max upgrades, and then some, but i thought it was a majorly strange way to list them all. just things to consider for your next release.