I loved it! It's a 5 star game.
Have you played Snakebird and/or Jelly no Puzzle? Although both are very different from this game mechanics-wise, your game has a lot in common with them in terms of charm and surprising difficulty. If you were to expand on the game it would be really cool to see what kind of brain-breaking puzzles are possible with our dear Prince Horizontival and Duke Vert (since for designing the real devilish kind of puzzles 48 hours just isn't enough).