The game is not primary about pregnancy. It is rather an escalation of lewdity-game. Pregnancy is rather a side effect of your doings. You start at a low level, getting to know some girls and getting more and more involved doing lewd activities with them, which finally leads to sex, orgies and to the first pregnancy.
Also, I think, the dev does this more to his enjoyment as for earning money with this. He has still less than 100 patrons for the project. Nevertheless there are constant updates every few months. The amount of patrons does in my opinion not reflect the quality of the game at all. The story is very good, hilarious written with many references to pop culture. Additionally the dev is a creative master. He has many interesting ideas, which I have personally never witnessed in lewd-games before. There is e.g. a voyeuristic exhibitionist Ninja and after playing you will see "seaguls" and "coffee with cream" from a total new perspective.