The song is 'Possibility' by Autoheart
Psychonauts 2 is a game by Double Fine (you should play it!)
(Video quality is intentional! Couldn't make it HD if I tried)

3 months of development, with a pause in the middle for October dailies, and it's finally here! 250 frames and ending at nearly 4:20min, this is definitely the biggest project I've worked on alone and for fun. I'm hoping to do another one but I hope you enjoy this one for now!