Oh yeah sick and preety neat, took me a minute to figure the controls out and figure out I wasn't trying to make a neat lookin clean board here, but after a bit of fidjingling around it was fun! Though you should add a small descruption of what the hell is going on somewhere, main menu or the game's description.
Also, if ya plan to develop this game further, I have to say be careful. It's similar to tetris and feels similar to play, which is awsome becouse tetris is cool, but the horror stories of Alexey Pajitnov seeing tetraminos everywhere irl and playing the game for many hours into the night, every night, before adding a limiter in the form of ever increasing drop speed, are very much all true, and a warning to heed with these kindsa projects.