Searching GitHub directly for "BitLife" reveals numerous repositories (repos) titled "BitLife-Mod," "BitLife-GodMode," or "BitLife-Unlocker." These usually contain a file called bitlife.apk (for Android).
However, for the curious developer, exploring the GitHub repositories (without downloading sketchy APKs) is a fantastic way to learn how reverse-engineering and Unity modding actually function. bitlife githubio work