Come inside her, put her clothes back on, press the kleenex button if you also came anywhere outside her, and then click the door button on the bottom left. This gives you the good ending and unlocks free mode. Free mode options, like costumes and x-rays, become available in regular mode, too, which kinda made me think there might be a second good ending? You can come in her womb multiple times to fill it up, so it would be a shame if they added all this and didn't even add a bonus pregnancy ending. I just lost my patience from losing again so I'm done with the game today.
Tips to win easier:
1) keep your eye on the number of Z's coming out of her head. That's more reliable than watching her eyes or listening to her moans.
2) It's easier to slip it in if you've made her come first. In fact, if you stick in immediately after she comes and do nothing but pump her from then on, you'll both come at the same time, every time, how romantic! She's very sensitive if you put in dry, yeah, but it's still doable.
3) The fastest way to a win is to get her naked, jerk yourself until you're 90% done, right click her pussy to enter it easily (and then right click to stop as soon as she starts to wake up), make sure you've selected the 'cum inside' on the left underneath the mushroom button, and then left click the rest of the way until you finish, and then pull out all the way. Clothes back on and out the door, you don't even have to clean up. She'll even be dripping jizz during the ending cutscene without noticing lol
also also, here's a de-censor mod:
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Just replace the file with the same name. Doesn't work on the man-parts though.