Very solid demo! Fantastic animated intro, fun mechanics, and a cool unique monster. The demo is quite difficult, but I managed to beat it on normal. I am looking forward to the full release. Hopefully more things to do than just pick up objects, such as cleaning the countertops, replace lightbulbs, wash the dishes, etc. The vacuum noise is somewhat random to me. (To be fair I am hard of hearing, but I feel like sometimes the vacuum noise does not activate even when the monster is the other side of the door.) Oh if possible I would love some subtitles. It seems like you did it very briefly in the intro but not in the 2D animation.
I can tell you put a lot of time and effort in this game. I think its a great demo. Minor tweaks here and there nothing too major that I can think of at the moment. Well done mate!