Brave hundreds of hand-crafted challenges as you help Madeline survive her journey to the top of Celeste Mountain! · By Matt Makes Games, Noel
We need the source code
It's most likely based on the same engine as Towerfall. Matt open sourced it a while ago : https://bitbucket.org/MattThorson/monocle-engine. It's probably outdated, but still.
I think we won't ever see the full source of this game but they posted this recently:
Some of the code not the full source.
This is a commercial game. They don't have any obligation to post the full source and by putting the Player class they are being kind enough already. Be grateful!
They would ruin the profit of the game when releasing the source code, people could just download it and compile a version of their own....
Though I'd like to see a level editor, maybe even some modding options later on
Player source only i need.