Nice game! Reminds me of those simon toys. The animations & effects on e.g. game start and hitting a platform give the game a nice feel.
This game would really benefit from a high score table, for example it would be great fun to compete between friends at one computer. Another thing that would really elevate this is adding sound effects for correct platform & not hitting the platform. As well as some energetic background music, I think it would really tie the experience together.