I liked the game art. Very well polished experience. Though at certain points I noticed that the player didn't came out of the portal that I expected, even though the colors matched. But either way, the level design was such that it helped me figure out my way out. Though I later read your description and it was supposed to be an intensional bug, and in that case it was well implemented.
Overall, the short little experience felt satisfying. Great game! :)