Sounds like you need/could split it up into core/engine functionality, and then implementation of that core in different environments (i.e. a ios and android on

Sounds like you need/could split it up into core/engine functionality, and then implementation of that core in different environments (i.e. a ios and android one). That makes sense to me, to have 3 repositories. Common code, perhaps even in your own dsl. And then implementations done in the various platforms.