Outside the gym boss, ammo is quite unimportant. Press the surrender Button, escape the animation then abuse the 3 seconds of iframes. Most mobs can be skipped that way, although being a bit tedious. The only mobs that need attention are Flies because they spit first ask questions later and spiders. Their melee animation seems to be larger than the surrender hitbox. You can juke them by approaching, dodgeing their first attack then step near and press surrender.Once I figured out how to beat the first boss (in the gym) was pretty easy sailing, while being pretty important to manage ammo. Plenty of fun/sexy enemies later once you get past the high school, the zombies are pretty lame IMO. The spiders later were specially fun, with a lot of attention to detail for the spiders body makes them seem squishy and tries to create a sense of impact as they fuck the character.
My only gripe (outside of the occasional bugs, got stuck crouching once and had to open the menu to fix this) is impregnation is only through oviposition at this point and time, so while its a fun mechanic only the flies, spiders and tentacles take advantage of it. it is well animated and plays pretty smoothly, if tedious at times especially early on when you find almost no ammo and its just more practical to poke the zombies to death with her uh...stick - but once you get out of the highschool its far more enjoyable IMO, you can tell a good porn game when it compels you to keep going just to see whats next as opposed to sitting around getting raped into oblivion.
I started a new pacifist run and only shot the boss or healthkits in hanging in spiderwebs.