Really cool mechanics! I liked the ghost idea, and I think it was well implemented, only on the last level it was hard timing up because I wasnt able to calculate correctly the time for pressing the buttons, and I think the colaiders for the lazer were to big, maybe a slower walking of the ghost or a hint of where the lazers or the purple boxes are may help to make on that level, but I really like the game, the puzzles were really cleaver! with more levels this will be awesome! great job! :D