I like the explosions effect and the sound effects of your game. My engine is very basic, its main goal is to be small, fast and simple, the whole game fits in 100kb compressed. I'm not sure if you realized that the goal of the game is to catch the "particle effects when the block is broken" (aka coins). They didn't look enough like coins before for this to be understandable. The size of the blocks depends on the level size. At the start of the run you get levels with a few huge bricks, at the end you get levels with tons of smaller bricks. I'm confused about which "little effect when the ball hits the paddle" you are talking about, it might be something related to the perks you got.