The word “idle” is in the title of this game but there isn’t any form of automation whatsoever. Without automation there’s almost no reason for upgrades, and you won’t find those here either. Lastly, I played long enough to unlock slot 26 and customers stopped coming out of the mall. I was hoping that there’d be some deeper level of play once you unlocked all the slot, but it’s just a broken game with no depth wanting to gain your data.