Hello Kay :-D Thank you so much for this message and for your feedback. I'll answer it so you can understand some of my choices.
(I am French. I translate this message with google trad. Sorry if you find something a little strange there ^^)
I chose not to show the character's face and never leave any clues as to their gender because for me, the person had to be the player. The head you can best visualize at the end is simply your own. Of course, this narrative method / artistic choice has its limits and is not perfect.
I wouldn't do a direct sequel to this game and your storyline idea made me feel good because it reminded me of the ideas I had when I was 20 and I really liked that time of my life. Today I have a slightly different approach. My style would be more to create a new game in the same universe but without a direct link (it's a choice that I hold from a writer that I like very much. H.P. Lovecraft).
For the creature that you don't see and that roams outside the house, I wanted to make it as simple as possible by playing on the player's imagination. The most important thing for me was to find a good excuse so that the player/character couldn't do what everyone would have the good sense to do in this kind of situation (break a window and get the hell out of this place).
But to be honest, if I had to make a long version of this game I think I would add a complete scene where we should interact with this creature. So I agree with you on that.
Again thank you very much for playing my game and for taking the time to take an interest in it enough to give me all this feedback. Take good care of yourself and greetings from France !