Yeah, the dev of Parasite Inside is just catering to vanilla content, and there is no real monster action or anything much related to parasites happening to the Protag.
Like, 90% of the sex content from there is just about being sprinkled in spore dust and get send to an area tied to a scene (especially if you played the previous versions), and its just pure vanilla (basically no actual cum scene or kinky stuff)
The only thing they did better in the current version is adding some minor hazards that you have to either struggle spam or shoot down, but its very much tame since the one you have to struggle just to get out of does nothing sexy and its only damaging and causing spore toxic.
I actually believe that Parasite Echo is going to get better at it during the next couple of updates.