Amazing entry, it's your first GWJ entry and I would not be surprised if you'd also come in first place :)
The left/right movement was a bit floaty/sliding sometimes (and the quadropus should've been able to use its suction cups to avoid that!). The hitbox sometimes felt every so slightly bigger than was right. Otherwise the game felt great and fair. Good difficulty, forgiving checkpoints, fun narration and great music. In the end I pressed the --- button, but afterwards I decided to still press the other button. I'll probably go ahead and download the source so I can put myself at the end and experience the original --- button ending :)