Cool concept! I really like what you did with the two unique vibes for the story, and there's that nice poetic quality when taking the different meanings of the word 'inter'.
At first I wanted to play spooky storyline first because I love horror, but knew that it's always the better choice to do cozy first if I would play them both anyway. What a (train) ride it is!
I've got a soft spot for your use of stock photos, since you always incorporate cool VFX with them. There's also that feeling of deliberate leaving out certain details (explained in next section).
[Spoilers]
I didn't know that this would be linked to "Winters", so that was a pleasant surprise. It maybe kind of is telegraphed because it uses the same visual style. The mother and child are so sinister in the spooky version, which I found to be very effective horror, as I was caught off-guard by always seeing them as faceless background NPCs who set the cute family bonding atmosphere (this theme that is felt strongly due to the conversations between MC and her friend). I also felt it to be unique that the MC is quite pre-occupied with her phone that she's not noticing anything happening around her, while we as audience know the situation is bad, without actually ever seeing the full face of horror.