Now I see why your game is similar to mine :) Good job in putting all of this together! I sustain most of what B-Deshi Dev wrote below, and I would also add that the second level needs *some* indication as to "headbump" mechanic incoming, otherwise it's very hard for a first time player to figure it out. I know 2 players would come up with solutions faster, just saying *some tutorial* or indicator would help (that's what I forgot to add at the beginning of my first gamejam game, and nobody figured out what to do). Still in the second level, the second (vertical) challenge is also terribly hard to figure out (for me), dunno about the other players.
Otherwise I love the art style, the light/shadow play, and the story fits the game. Good job again, and keep in mind what I said about *minimal* tutorials ;)