Parts of the source code is available on GitHub.
https://github.com/VirtualBrightPlayz/EchoesPublic
Just a heads up that the game isn't open source, but rather source available. Check the licenses for more info.
I recently opened up the playtest to the public, and after seeing what people think of the project, I've decided to work on it more. The playtest will remain public for the time being.
Shoutout to all of the people who helped make the game what it is today. :)
Virtual