I suppose that you know that game ?
https://store.steampowered.com/app/845590/God_is_a_Cube_Programming_Robot_Cubes

I don't know if it is good. But its author is deliciously crazy about cubes : http://godisacube.com

It is fun to read its concept.

yeah cool thanks!

wait... if cube is God, and i'm the creator of cube, I AM AN OVERGOD OF ALL GODS!

Sounds legit, with the nested nature of cubes