Imbalance becomes a fun killer.
The game has potential to be really cool. But the one thing being a serious boon to GTD8 are the controls and game speed. Sure, we can move all 4 cardinal directions but there's an imbalance in the character movement speed:vertical speed scrolling speed ratio. It becomes frustrating despite you're in a good spot, far bottom, and get the read where a block is, you can't dodge it simply because your character is too slow. Your animations are good and I do approve of the music. It shows you can do something cool with flash.
Fix up the ratio and the game will no longer hold that negative weight.