If you don't put any compounding upgrades in your game, you'll lose a big part of the incremental community. Additive upgrade effects become less impactful over time, and the game turns into "I grind more for an upgrade that does less."

You have to think about your progression in an exponential way, not an additive one. People don't like incremental games just because the numbers get bigger; they like them because the growth itself keeps growing.

(ik this game is old, i'm just giving some general advice)