Spoilers ahead! Reader beware.
Theme: Lovecraftian brain bigger + emotional growth. I see it.
Story: I appreciate seeing a work from someone who spends hours writing. You've retreading common beats of these romantic works that I imagine are on Ao3, and in that, I'm not upset, because romance is formulaic because it works.
It's a sign of a good work when you go in disliking a character and then come out liking them more (Roan), or going in saying "You're not all wrong but you're half wrong" (Godfather) and then he comes out going "Okay, i'm not all right". Chef kiss. Love to see it. You did the trope of "shared love person has something bad/goes missing and it brings the other two together" and you know what? Always a good one.
I guess my only real criticism is that Will felt a bit male-wifey beyond the narrative's commentary? The commentary felt more as though it was about a woman first (with like the parental figure being like "I instilled that you don't have to be this sort of person" and then it translated over to a man, but feminism, misogyny, misandry and other gendered items are inextricably linked so that's just par for the course, really.
----
Story aside: I don't know about the explicit validation of Lovecraft even if the work does call him out as a racist. I'm not sure how to feel about that and how that speaks towards his collections of works canonically within your universe.
----
Presentation: I like a lot of your visuals and period sfx. Wasn't quite a fan of Roan floating on the road-- would have maybe preferred a side sprite + a car for those bits.
I think we needed some measure of music-- the medium expects it, and it was infrequently there.
Good pulls/backgrounds for the cosmic horror bits.
Creativity: Fun stuff to have cthulu framing for the romance. I don't know how much of a monster fucker you are, but this is like the Sucker for Love Series so ya know... :p https://www.goodreads.com/series/298243-sucker-for-love-mysteries
Overall thoughts: Love to see a polished writer at play, although I think we saw more of a fanfic with some visuals than a work making full use of the medium. Breezed through it though. Love to see well practiced prose and dialogue (don't worry, I don't bully too much over occasional grammar errors lol).