The movement was original and frankly very fun! The levels are designed wonderfully and keep you engaged.
If I had to list a negative it would be that the Inputs, if pressed too quickly, are ignored and you end up falling to your death.
Also, not sure if this is a bug, but if you press the jump button right at the apex of you jump you can double jump sometimes. I'm guessing that you are using the player speed for your grounded check, and since there is a split second right before the die starts falling where it's velocity is at zero, you are able to double jump. May be something else though.
All in all, very enjoyable! Ended up playing for over 20 minutes.