Everyone else has already added some good feedback, so I won't say aaaas much as I normally would. Readers can be pretty finicky sometimes about discrepancies, and downright rude in their delivery of said discrepancies, or sharing their preferences. If someone shares genuinely good feedback, that works with your comic, then try playing around with it. Otherwise, don't worry too much about it, you'll get more unsolicited feedback as you gain more followers.
I agree with Moose that your value and lighting can use some work, your shading is very samey. There isn't a whole lot of difference between outdoor and indoor lighting, there's not hard vs. soft light/shadows, and it tends to be at similar angles on the characters. This causes the mood to be a little flat.
Aside from Hitchcock movies I would suggest check out general horror cinematography analyses as well, or general horror movie analyses, they may give you an idea of what you can do to give your more frightening or hectic scenes some oomph.
Color Theory in Horror might be of use to you, or you could check out this person's whole playlist, they all have some interesting thoughts on the genre.
Super Eyepatch Wolf's video on Junji Ito is pretty interesting.
As well as his video on Perfect Blue.
I also rather like Brady Bessette's cinematography 101 video on shooting a horror movie.
Here is another good playlist of composition, coloring and lighting in cinematography.
Even the most subtle horror is very visually driven, and relies a lot on angles, colors, and shading/lighting. (Mystery too!) If you have time, try playing around with dramatic setting with standalone panels or quick concept illustrations. Make yourself a little uncomfortable with angles and colors or contrasts, don't be scared of sucking because it'll just be for casual practice.
One thing I notice personally as a reader is your linework is a little weak compared to your crisp cel shading, and is sometimes a little wobbly or sketchy in a way that doesn't quite fit the rest of your style. Now I'm not going to pretend to know how digital inking feels since it's been a hot minute since I've worked with that medium, so I'll just share general stuff I've learned.
So you got some line variation going on, but there doesn't seem to be a whole lot of rhyme or reason to it, and how your lines taper off makes foreground/main focus stuff blend in with the backgrounds. It's also a little jagged, making characters feel stiff. Line weight helps with guiding the reader's eye to certain parts of a scene, or character, as well as giving them a feeling of weight and flow within the world they're in. You can also use ink to add a feeling of urgency to action focused scenes by using more jagged, sketchy lines to convey strong, swift movements.
Similar to what I previously suggested, in your spare time try sketching out a stand alone panel or concept illustration, and use it to play around with inking techniques. You can even combine the ink practice with your color and value, try different hatching techniques (Or free hatching brushes.) with colours, or scenes. You may find out some really interesting things!
And again, don't be don't stress sucking with these, they're just fun sketches to try out new things.
Unfortunately the only inking tutorial I remember off the top of my head is this one. It's for traditional, but gives good advice on what I'm talking about with line weight.
Here's a video with some digital hatching techniques that may be helpful to you.
Sure, this stuff is going to take a while to do, but the more you do it the better and faster you'll get. The nice thing about doing a free-to-read comic is you can afford to take longer to improve some stuff with your work, so don't be afraid to go in small breaks, or take longer to get episodes out to play around with your style.
With that, the same can be said for my feedback. Given your comic is free you can totally ignore this if you don't find it useful, or interesting in any way. I figured I would just throw my opinion out there in case you got anything out of it. Either way, do what you feel is best for you and your work! If you don't feel you can take the time to do extra stuff, or don't think it would benefit your story, don't do it.
Good luck! Regardless of the feedback I really enjoy your comic, and have been reading it practically since you started hanging out on the forum. You're still doing a great job, and you put in a shit-ton of polish despite working on this for free.