It is a full release more or less, some bugs and kinks to be worked out. Hope that some people will get through it all and tell which ones are there. You can get to the credits my man. Really glad you enjoyed it. The music in the motel is intentionally set up that way, and then you get another track for the final fight. It is supposed to trigger when the door opens though, so there actually is a bug there but not the one you thought.
The darker aspects of the story become more apparent with time, but no, there is no real eroticism. Some demons are themed on those kinds of subjects though but with the intention of having sad or horrific implications rather than something being sexy.