Freedom Planet is available on PC and Mac, and is coming to Wii U this summer.
The guy who created it, actually started it off as a Sonic fangame.
He had a demo, and was told it was so good, he should make his own IP.
He then found a Chinese artist on DeviantART and asked permission to use her characters, which he did.
Really interesting story behind all of this, looks a lot like a Classic Sonic game.
I'll try the free demo this weekend.