
Game updated!
In order to open the robot faction, you need to visit the rusty world. Robots create a resource "Power boost", which, in turn, increases the efficiency of crystals. Robots are not reset on normal restarts (but are reset when traveling through worlds).
The Rusty World -- the final world in the game. It unlocks the robot faction, and, in a sense, its completion could be considered as the game finale. The robot faction, however, will also be unlocked to all other worlds after that.