Really really interesting concept, and a good implementation of it. it is a simple but is a really nice incremental game.
Though the gameplay leaves much to be desired. It took me like 5 minutes to finally get what I was supposed to do, as in have the card number be same as the timer. I was under the impression that it was the +/- number that needed to be subtracted in the slot.
The progression is also very slow. It takes several runs just to get another factory. That could definitely be touched on.
The UI though simple and works, could be improved. Especially the card placements in the slots. And the game end is also delayed for some reason without any reason for the wait.
I do like the overall shop and the progression system, just wish it was faster.