Could use some polish in some aspects. I think moving platforms worked kind of strange especially when they were going down - you should stick the character to the platform moving down instead of letting them fall freely. It looked awkward on some of the platforms. On top of that a short death animation would definitely help with understanding what's happening in the game. And level transitions could have been shorter, they felt a bit too long with not much to offer.
That being said, it's a neat little game. I like the way mechanics are introduced and how it keeps the things fresh with simple, but nicely designed levels. Good work!