Well, I don't have the game yet so my enemy knowledge is only of the trailers...
So, there seems to be:
Normal Zombie
Fat/Bloated Zombie
Face Tentacle Zombie(?)
Crawler? (4 legged tube monster)
Walker (2 legged tube monster)
So let's say you're defeated by a normal zombie: Perhaps a threesome with the protagonist being spitroasted sideways?
And more unorthodox would be the Face Tentacle Zombie: Maybe it forces its tentacles into your mouth as it fucks you.
I also wonder if the tube monsters can just slowly swallow you for a game over scene (both versions).
Also, semi-tangent question please:
If I purchase the current Early access version of the game, will I have access to the Steam version as well, when it releases on there?