This was a fun, little game. The animation was cute, and the simply design of the rest of the game suited it well. I liked your use of different spaces and colors to show different block types. The game play was fun and the level progression felt good.
I think adding an in-game timer would be a nice addition. Since the game already encourages speed running, I think having a visible time going during the game would add to that. Likewise, having a start button at the beginning, and try again at the end would be a nice touch.
The text was a little small, and hard to read. The game was still completely playable, but it would have been nice if the text had been a little easier to read, particularly trying to read it quickly.
Overall, I think you did a good job with this game.