Solargene, a space colony-builder where you can expand on the planets and moons of the solar system (including space stations), with complex, modular building mechanics (with support for Z levels) released on Steam

This looks really good. Feel like something beyond your run of the mill space colony builder. A complex building system in 3D (with both land colonies and space stations) and it also seems to have additional strategic layer.

Reminds of a cross between Planetbase and the old school Moon Tycoon. I think this could give Planetbase 2 a run for its money.