Very nice idea.
It's difficult, but some of that difficulty comes from how the character moves. Platformer controllers are very hard to do right, but you are going in the right direction and I'm sure that next time it will be even better.
Falling obstacles look like they will hurt you. Some less dangerous color would be better IMO, perhaps something that blends with regular floor, to make it more challenging to spot.
Great job. Keep it up!