Pretty mediocre Idle game. The single star is for the overall "style" of the game, but the rest needs to be redone.

Pretty confusing metrics, useless core upgrades, no content other than "get to the last core",  nothing to break away from the main thing which is either "click or let the robots do their job".

I'd suggest the creators look into other idle games like Anti-Idle, Antimatter Dimensions, NGU Idle, Idling To Rule The Gods or any other good Idle game to see how they change their gameplay to break from the core idle mechanics.

So if you want a good idle game, there are plenty out there for free. This isn't free, nor one of them.