So firstly, I really like the game so far. I did come across an odd bug though. I'll try to write it in a little detail so the problem is easier to identify.
If space is pressed before breeding a surrogate (or even after) then the pregnancy will start and progress as if rest was pressed. If you only press space once while with a surrogate, you will be able to get through one pregnancy and then no more, the game stops you from getting through another pregnancy. Basically if you press space while with a surrogate you wont be able to do another pregnancy as the game breaks. I don't exactly know what it does when used with multiple surrogates but I'm guessing it will bug out in the same way or some similar way.
The game is quite fun so far though, the new food menu is quite nice and overall, I think the game has a ton of potential. Best of luck to your work!