There are multiple "GitHub" associations for this game, often referring to hosted versions or development tools: Ragdoll hit ragdollhit-12 - GitHub
If you are ready to start coding your own version, let me know:
If you see an .apk file and the repo has no source code (just a binary), . Real open-source projects will have the full code.
All three run in a browser, zero install, zero ads.
Ragdoll physics are prone to "explosion" (where joints separate violently due to solver errors).