I decided to stay just to see what happens and wow, that was cold. Like wth man. And based on the comments it seems that there are two endings, that being killed at the very last instance while getting killed in multiple ways. I also agree with kootcies about multiple endings, using objects to our advantage, and others within their comment (seriously I love how they expounded on the idea cause it is a good idea all things consider, but it does feel limited and flat).
I'd also like it if we could have different dialogues when clicking on the objects within the basement that change depending on the day and the mood of the MC because it can be kinda tiring having to reread the same dialogue over and over again, especially when it doesn't match with the MC's current mood. You could also sneak in possible elimination or schemes through the dialogue as MC get's either desperate or creative in order to escape the Stalker.
It would also be nice if we had more convos with Stalker and within the convos we could either learn more about the plot before MC got kidnapped, Stalker's backstory, and doing our best to manipulate or placate him while either trying to keep our sanity and dignity intact. And the breakdown of MC to either kill or accept their position within Stalker's life would be great to witness because we start off trying to escape to then trying to appease Stalker and then being brainwashed and broken down to only be with Stalker. It'd be funny to see if the tables could be reversed.
Other than that, it's a nice little visual novel. The art is really good and the premise while isn't exactly original or unique is great in cultivating a lot more ideas! Goodluck to any future projects~!