That's awesome! I've been working on a cubeworld style game and I decided to create its own game engine for it to be as optimized as possible. Is performance an issue in your game? Like do you feel that Unity at some point will be a problem for your game?
Unity's performance is actually pretty great when you know what to do and what to avoid. I do encounter new problems all the time - such as a crash when trying to optimize a chunk mesh which im dealing with right now. It totally beats making an engine from scratch, lots of tools