https://gist.github.com/Rad586/eb6f3981ffbcb49cbb4856a62b9ce6ed
I made "overworld portal" to spawn on end midlands, since minecells dimensions are hard. After entering the portal(in survival), the game crashes.

The overworld is supposed to be the entrypoint for Mine Cells. I'm not planning to support the End and other dimensions as the entrypoints, as I can think of a few ways it could complicate the progression logic.