Boring
If you're gonna rip off Tetris, you should at least try to do something new with the game more than just tack on a violent theme. This was actually worse than the original; slower, more dull, worse control, and most importantly, the point bonus for clearing 2, 3, or 4 rows with one move is gone. Making a 'Tetris' has no reward whatsoever, and that makes this game fail.