We need the source code
Brave hundreds of hand-crafted challenges as you help Madeline survive her journey to the top of Celeste Mountain! · By
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 It's probably outdated, but still.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:
https://github.com/NoelFB/Celeste/blob/master/Source/Player.cs
Honestly how many people (even techy people) have the patience/knowledge to compile source code?
They could quite literally lose near-zero sales if they were to do so but I'm curious why there's such a movement on itch that demands indie devs to open-source their work. Game devs are under ZERO obligation/requirement to open-source anything for any reason or no reason.
I'm a huge FOSS advocate but I am also much more respectful about it than most people do. The dorks being rude about it give all of FOSS a bad impression. :(
That said, I am happy the devs have contributed as much as they have to open-sourcing portions of the game and engine.
The sad reality is that the majority of these open-source releases tend to be used/abused/plagiarized by other companies/competitors more than they benefit the actual FOSS community. I don't blame any dev that chooses to keep things close(d) to the source ;)
I compiled sourcecode myself to save 15 € for Aseprite. But it's pretty much the only Software I know that uses this specific combination of Open-Source and paid.
Agreed though, code is intellectual property, and as much as I appreciate Free and Open-Source Software, if someone doesn't want to share something they've put hours of work into in for free, I fully respect that.