Is it somehow possible to play Unity PC games on Android (without having access to the project)?

Let’s say I want to play a simple indie game made with Unity on Android.

Can I somehow do that? I mean, without ripping everything and rebuilding it, because thats almost impossible.

Maybe by moving and splitting the files from the PC version into an APK?

No, they’re completely incompatible. You would need to be running some sort of Windows/x86 emulator.