Hey, nice gameplay! I liked swapping between two dimensions. The walking eyeball was cute.
It would've been nice to have the music loop after using portal rather than starting in the beginning. Also would have liked to save a checkpoint every time you used a portal, because starting over from the very beginning of the level was rather frustrating.
Having the game loop around and end up right below the starting area was a nice addition, as well as the colored treasures showing up as a reward for beating the game, and the ability to sit on the throne like a king.