Got really excited to try this one out after seeing some of the demo gifs. Im ashamed to say... I can not figure this out for the life of me
So the Insect latching onto you scene... it's in the older version of the game as i have yet to find it in the most recent with the mansion/laboratory improved versions.
When your in the lab (old version) there is a kitchen, you open the door there and walk inside and boom you get attacked by the insects.
the newer version is more elaborate, you grab the paint and paint either the EAST or WEST key, then pick up the same key you painted to open its respective doors.
After that basically one leads to another.
sometimes you will enter the dream into a lab area, thats a little more fun as it has different and returning types of creatures ie: the Futanari monster, a Penis Parasite (turns you into a futa yourself), a bunny parasite (turns you into a bunny creature), and of course tentacles (not sure if they do anything or just knock you back right now).
Quite a lot of things spread around the game though in the newer one ranging from Ghosts that possess you (and turn you into a bigger breasted woman), impregnate you, and one that just does.. Something (couldnt tell as it was too damn dark in room lol).