This was a neat visual novel! I enjoy the wordplay for the title.
SPOILERS (sort of)
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I really appreciated the puzzles. They were very well done (although I did get a bit stuck on the passcode one, until I realized that the keys had letters on them xD Then I managed to guess correctly) I didn't even expect there to be a sliding puzzle! That was a nice touch.
The story was a lot of fun, too. It definitely felt like a thriller with how everything played out. (I did guess a bit early on that Soma wasn't exactly who he said he was, but I did go into this game kind of expecting him to be bad news. Even if he's absolutely adorable!)
I enjoyed all of the endings, and I was glad that the friend was okay in the good ending... presumably they're okay in all of the endings, though.
The little bit of voice acting was great, too! But you may want to make the volume for the voices to be louder. I had to do a lot of adjusting with my capture and editing programs to get it to be the right volume. (It's probably not as big of a deal for people who aren't recording a playthrough, though.)
Overall, this was very fun! It captures the feel of the Halloween Season very well.