This is a tough game. It functions well but the difficultly keeps it from being more enjoyable. Though to be quite honest, the progression in difficulty makes sense. It's just that, given the small 64x64 window, the time in takes your brain to process the incoming shape, the shape below, and the shape that needs to swap, all while ignoring the color, is just too much for the time it takes the shape to fall.
I'm curious as to what would consistitute as a good score. My highest was 15. Overall, it's well made, looks and sounds good, and is easy to pick up and play, it's just the nature of the game is too challenging too quickly.