Well first off, congratulations on your first VN! I think you're getting out of the blocks pretty well here with a lovely gun safety PSA featuring a cast of characters who are clearly very sane and have no trauma-induced psychological conditions. At all. Whatsoever.
I'll just set the general spoiler warning here.
Presentation is decent here, especially considering how new you are to the process, the time limits of the jam, and the fact that you're a one-man show. Not a ton of sprite variation but what's there is solid; wish we could've seen Luca in the game since he's visible on the store page, but I understand that it would've been difficult to incorporate without like, a forced mirror shot or something given the very limited first person perspective. Coloring out Noah's face works well once you realize that Luca's last memory of Noah's face has a big hole in it (double nice if that's what the scar on the store page image represents). Binary text kinda does the same thing - Luca won't let himself remember anything that could indicate his guilt. Music and sound was incorporated well enough, though I thought the "crazy" music on the "pathetic" route may have been a bit much. I think maybe some more atmospheric or subtly unsettling music would've worked better there since it's already very clear how nuts Luca is by that point. Also, the car horn quasi-jumpscare was probably unnecessary? Might've been better just to fade out of the dream and into reality to avoid the cliche.
I did think it was weird that Stuck in November was written not only on the computer in the menu, but also within the game. I interpret the title as being the three central characters being trapped in the same moment in time, either through psychosis or being dead, so I'm not sure why this would be written on the computer itself (unless it's just an error and that was just supposed to be for the menu). Writing composition is mostly solid, but there are some pretty egregious typos (e.g., "how tight my hands grasp at the steering win" -> wheel) that could have benefited from another proofreading pass.
In terms of plot, to be honest I had a hard time suspending my disbelief for most of the interactions between Luca and Henry prior the climax. I understand they're both supposed to be varying degrees of crazy, but nothing really felt like a normal cop-witness interaction, so I wasn't buying that it took Henry as long as he did to get suspicious. I think Luca's plan falling apart earlier on could've also added a lot more tension leading up to the climax instead of Luca being in control of the situation mostly the whole way through.
For other issues with the story, I felt that it was fairly predictable once Luca gets on the computer and finds that the last interaction was the hunting trip, but I could also see that as intentional to build a feeling of dread. Also, while the thematic throughline appears to be coming to terms with the guilt stemming both from Noah's death and the efforts to cover it up, both routes seem to end a bit abruptly once this realization is achieved. I think the "human" route attempts some introspection on how both Luca and Henry repressed their memories to live in denial about the killing, but I think it could've been fleshed out a bit more to let that scene breathe since we go from realization to hug to credits really quickly. I also think it would have been much more impactful in the "pathetic" route if Luca's suicide attempt failed (e.g., the rifle backfired) so, after killing Henry without acknowledging how significant his own role was in Noah's death, he'd then have to live with to deaths on his hands without being able to take the easy way out, emphasizing that he may have been just as "pathetic" as Henry.
Overall, as stated above, while there were a few parts I think could've been improved, this was a really solid effort for your first attempt!