The art for this jam project is easily the best I've seen so far in this jam. Halloween vibes are masterfully crafted into the UI and curso and the premise of the story seems tailor made for this jam. And to make such a stylish game in such a short amount of time is impressive to say the least. The CG near the end of the game was really funny as were the transitions; one such transition involving the MC screaming.
The voicework is cunningly applied. I've noticed several VNs that record grunts and one-liners to save money but sill have an immersive effect. The options listed are solid and accessible as well. I always appreciate having the ability to turn down the volume. You'd be amazed at how many jam projects don't let you do this.
Seeing as this project is still a work-in-progress, I highly recommend finding a proofreader or a line editor to search for structural and grammatical errors in the script. It appears that you aren't a native speaker, seeing as some of the voicelines are recorded in Japanese. All the more reason to find someone qualified to help you iron out the script. Perhaps one of your fans can assist you in this.
Another problem is the choices. A lot of them simply have no effect. If anyone has found the "bad end" you'd understand where I'm coming from. However some would be bad even if this game had a yuear in the oven. I found once branching path near the end that said the same thing, but with different words. Also choices that branch back to the original choice menu should be used sparingly. I'm referring to the "black cat" choice.
Story-wise, this is a solid piece for a jam project. But if you plan on making this a full-fledged visual novel, I highly recommend delving deeper into each character and adding more to their lore. Your premise is solid, the world is interesting, and your cast is enjoyable. I believe that you can turn this into a formidable game, especially with that art!
Best of luck in the jam!