I'm a fan of the art style you have going on here! Some of the panels are really captivating when you add in the extra lines for that "sketchy" feel. I'd recommend experimenting more with your line work, given that you don't really have to worry about color. Some of my favorite panels are the close up shots you do, it's a great way to establish tension. However, do be careful about overusing them, or else they lose their effect. From time to time, instead of focusing on grotesque expression, try conveying emotion with different types of close-ups, a composition shift, a zoom-in on a tense fist. There are so many other ways to convey how a character is feeling than just through their face.
I've got to agree on adding a little color here or there. For instance, when the police cars arrived, I actually wasn't certain what the "eeeeee" sound effect was until I checked the description. Adding in some red and blue siren lights in some of the panels would've made the police cars more evident, and created a striking contrast.
All in all, it's a neat comic, there aren't any pressing issues with it, paneling's good, dialogue is easy to follow, pictures are clear.
If I had one qualm it would be to mind your update schedule. Since your episodes are only a page long, and the story strongly relies on tension, a lot of tension can end up getting lost in the week long wait. That's just my two cents though. If you really want to improve, I'd suggest studying some other successful horror comics. "Bastard" and "Sweet Home" were great at nailing suspense if you wanna check that out:
And if you have the time, I'd appreciate it if you could review my comic too!
If it ever gets boring, you can just skip until the last arc. Thank you!