At the moment I'm not really 100% sure about any definite direction the game will take. For now, it's simply going to be essentially a bunch of different playable scenes and(assuming you survive if you get eaten) being able to get through to different "stages" of the party.
Essentially, eventually playing through a scene will progress time at the party and you'll find the house in a different state where the party has progressed a bit(characters will likely be moved around to new locations, some new characters might be added, stuff like that). For now I'm hoping to get the party to have 3 "stages", the third of which will conclude in an ending depending on how you spent your time.
As for how complex I will get with ending variation.... I'm probably gonna try to keep it fairly simple as I'm still relatively new to this and I don't want to get too ambitious too quickly. I see the most complicated I will get atm as having certain characters not show up if they end up getting eaten (either by the player or by another character). For example, I am currently planning for (Spoiler alert) if you don't tell Will to leave Duncan alone(and you don't eat and digest him), Duncan doesn't make it through the first stage of the party(Will might have a bit more bulk to work off in that case <.<) and assuming he is saved from any subsequent attempts at being consumed, he will be present in some way in some endings. Of course, if he ends up getting churned at any point he will be missing in the end.
This is all, of course, dependent on things actually going to plan. I really can't guarantee anything at the moment considering how early on in development I am, and how little experience I have doing this.
It's also possible that once I am finished with this project I may move onto new projects that are more complex or story focused. I'm not really sure.