What a blast! This game has a lot of potential. The design is slick and there is clearly a high level of polish here. No area of the game sticks out in a bad way. My biggest criticism and what I think holds this back from being something I could play all day is variety. The variants are a good start, but in the end it is the same experience, regardless of the colors or shape. 2D games of this genre often will have powerups or powerdowns - things like specially marked blocks that change the gameplay. I think it would extend replayability if you could take that concept and apply it to a 3D game. Overall, fun game!