Great idea, though some combinations are really tough. That combined with really small platforms and a lot of obstacles and enemies made the game extremely hard.
I wasn't a fan of those slow downs (high ping) especially when I needed to wait for some platform to move out of the way :D The ability to re-roll level at any time was super cool, but the animation of rolling those elements is a bit too long.
It's great that the game restarts immediately, though I think I'd make it auto-restart on death.
The base of a really cool platformer is there, but some combos are just... brutal ;)