I really, really enjoyed this game. It's not quite dethroning Psychonauts as my favorite Double Fine game though. The art, and puzzles were really great. I felt pretty clever solving the song nav puzzle, and the wiring puzzle at the end gave me a Fez vibe which I enjoyed a lot.
I wish they could have explained Shay's parents being human though. I really wasn't buying the explanation. I think putting in something explicit saying that they had to be separated or something would have made it more plausible. I didn't really mind them reusing the environment assets for act 2, but I would have liked at least one more new area. I realize though that it was kind of necessary to get the game done.
Overall though good job, and I hope you guys get a break.