Hey everyone!
Several people have noted that the scaling feels off once you unlock the world promotion. This is because the heat upgrades were too cheap vs how much "benefit" they provide which ends up outpacing earnings completely. The goal of heat was to mainly buy the upgrades when you're feeling like you're getting bombarded with events rather than preemtively taking it and ending up feeling purposefully stuck or slowed down.
I've redone the numbers so that now, with full upgrades you cannot outpace yourself by simply buying more heat upgrades. They're still useful but by no means will end up locking you out of making progress for a long time when you pick up all of them.
I hope this helps for everyone who has encountered this issue.
Keep playing and let me know what you think!
- Ignace