I got the PC version from Greenman Gaming for $11.25, and now I'm just waiting for Steam to unlock it tomorrow afternoon. Reviews are in the 7-8 range, with a 7 from Gamespot and 7.9 from IGN.
I picked it up on the Wii U, played it for a few minutes before popping in Ni no Kuni. It's a fun little sidescroller, with some weird Ron Gilbert-y puzzles in there. Love the atmosphere and the art style. Jumping feels weird, and the framerate drops pretty consistently. Not enough to be unplayable, but the stuttering is definitely noticeable. According to Colin Moriarty, it has the same problems on XBLA, so it's not the Wii U. Hopefully those problems are mitigated on PC. I'm glad I dropped the money on it though, gotta support my favorite developers.