Like many have mentioned you have a nice thing going but it is held back by some minor oversights that stack up to become something more, small things like the slidiness making it hard to maneuver the red corridors, the pushing mechanic being painfully slow, or the need to get our hand of the keyboard to switch between blocks.
These are all things that could have been found and fixed relatively easily with a bit of time spent playtesting which IMHO is priceless.
I would really love to see the game have more of a focus on the puzzle aspect of and ditch the "rage game-esq" red corridors.
I loved the music and how it builds upon itself as you progress through the game.