Yep, joining the others here, the income-related upgrades are OP as hell, definitely needs to have costs scale upward as you buy more of them, AND outpace whatever income they give so you don't get exponential growth.
Just going off the passive upgrade, you can start getting infinite money about halfway through the second pregnancy, which is kinda bananas.
As for other comments about it so far:
- I like it overall, kinda feels like a really condensed version of an old Flash game I used to play a lot.
- Needs more things to do so we're not sitting here clicking Rest again and again and again and again, especially on the first pregnancy, where literally-literally all you can do is click Rest 21 times and that's it. Maybe the first pregnancy can start and progress a little in the intro cutscene, so the first round is only like 10 days, rather than the full 21?
- Maybe needs other upgrades? You'd have a couple other stats, like skin elasticity and milk production, there would be shots for these. Skin elasticity allows her to handle larger pregnancies as kind of a cap in size. For milk production, depending on how much milk you make, if you make enough for the babies, everything's fine, but not making enough gets you a percent decrease in profit from the pregnancy (not a huge decrease though.)