Space Exploration is an epic overhaul mod for Factorio.

I reviewed this mod in video form and intertwined with a base tour, but I’ve extraced the key points below. Despite some minor criticisms, this was one of the best Factorio experiences I’ve had. One of the best gaming experiences I’ve had. The scope of this mod is simply remarkable.

[Edit in 2024: There have been a number of major updates to this mod since this review, adding new functionality, significantly changing the tech progression and some recipes, and in general improving the overall experience even further.]