Sorry , im not into idle games maybe that's why , but i didn't found any reason to click .But if you tweak around , maybe random uneven resource generated and a max "distance" between positive and negativ , it could become a challenge . A light count in your head challenge and a reason to click. Manual scaling , so clicking either positiv or negativ , could make the random resource occur more often and the upgrade could be an alternating cost of negativ then positiv decrease in the random points. And there could be a second upgrade for a higher cost of either negativ or positiv that makes the difference between them greater , so the player has more room to make mistakes. I hope my thoughts are not unwelcome , it wasn't meant as critique , your game was maybe not for me but it made me think :) . I myself am not a great gamedeveloper yet so I have to work on my game , games also. Much room for development on my end so take everything I wrote with a grain of salt :)