Okay, here what i found through gameplay:
1) Energy bar: you can make only so much actions per day (cumshot, squish plants through grinder), at beginning you have enough energy only for 1 action
2) Kobolds don't instantly generate an egg (to know timing you can just to to impregnate your controlled kobold (like, yourself) and check how long it takes looking on UI near a stomach bar (under energy bar)
3) Green bubbles bar i mentioned before: it's limits how much can fruit juice change kobold (it seems like all juice from 1 fruit fills it completely), that means you must BREED and FEED kobolds to acquire larger proportions.
4) Every kobold have their own bars like yours: every kobold have energy bar, that can be seen at some moments, stomach bar, that can be guessed by level of belly inflation and, lets call it intoxication bar, that you may take in mind
5) Kobolds pass their colors AND sizes to offspring. (don't hope to collect semen through big onahole horse and impregnate kobold, from whos this semen has been collected to get breed with larger proportions - this way you get completely FLAT kobold females and, possibly, males).
6) I just mention here that money spawn on the next day after you sold something on the table near entrance into house.
7) Fruits still generates near cave - just on much slower rate (maybe it have to do something with rain), not only when you just started game.
So, what i can say - devs going right way - they limited juice effects, so breeding now is actual is useful thing. They extending gameplay by putting restrictions. Hopefully next thing would be traits for kobolds (Breeding season still on mind) to increase energy, stomach and intoxication bars and add new patterns on kobolds scales.
Oh, almost forget - to enjoy avaginal sex you must consider to make bigger dick and guide it into right right hole, then drag kobold into sex scene with dick still in. Tricky, i know, but currently that only way.