I just tried it out on Steam and it's extraordinary. I'm going to go ahead and preorder it because it's really incredible. The entire game has been one huge bucket of fun. I have nothing negative to say about it. No annoying Ubi DRM, at least in the demo, either, which sorta seals the deal.
It takes so many things I've seen in platformers and mixes it together incredibly. There are even homages to other games in it (and that's just what I saw from the demo). The artwork is incredible, colorful like Bastion, and the music is awesome.
http://store.steampowered.com/app/207490 -- Hit "demo" on the side!