Wasn't great, wasn't bad.
It seemed just okay....The rotating blocks are impossible, as they are too big for the passages. In the next (or final) version, please either remove the rotating blocks or make them smaller. Also, the graphics would have scored higher if it wasn't in black and white. Why don't you make it in color and put a few trippy images in the background?
Overall, besides needing a few modifications, it wasn't too shabby.