ok, reach the Blackhole and beat the game. As mentioned Delivery was unoptimal sometimes. For me, major issue was between e300 to e320, all bonuses goes backwards and everything maxed out, no way to improve anything at all. Just slug thru and grind more Sprinkles and even those gave no real upgrades. Have 1e86 Sprinkles = 2420% bonus, have 2e86 sprinkles gave 2421% .. a whole % for 2 hours farming sprinkles. and by this time my income went down from 2e314 to 5e313. There is something serious wrong with Donut Digits and Costumer Loyalty. Had lev 65 when gaining e50'ish, higher you advance the lower Consumer loyalty levels you can get. When beat the game I could buy lev20, lev 21 cost e350. Donut Digits cost e10880 at lev 41!?!? Good luck upgrade anything when struggle to even reach e320. Delivery Points died off too soon, at end have billions and even trillions but nothing to spend it on.
You're right, and I'm not sure how I missed that (too focused on money / storefront and not donuts smh).... Thank you for your comment and the specifics, I was able to track down exactly what was happening. The problem was the scaling based off baker tier, which has now been capped (the scaling, not the tier), so now levels will only become MORE affordable. The issue with the sprinkles was a different issue, and its curve was growing way too big for the bonus it gave, making it untenable.
Some of the donut upgrades are meant to be somewhat 'hardcapped', as the new content that's in the works will sky rocket donut count which would cause an avalanche of buying, but grinding for 30 minutes to get next to nothing is not the intended design.
Also added a new delivery point upgrade which gives +25% to delivery payouts, and it's infinite (aggressive scaling though). It unlocks at 90 deliveries completed.
Thank you so much for your feedback and I hope despite that deadzone you had fun playing the available content!