This is officially my favorite submission in the jam. To me, this kind of game is exactly what the eldritch genre is about. It's not some grand battle, just a person on the beach, trying not to look up.
Truly a beautiful experience, and has shown me that a very small game can be just so impactful for these things.
I wouldn't even want more gameplay, necessarily. Maybe just more dialogue, or a couple of dialogue choices. Alternatively, you could implement the mechanic that the thing in the sky only gets larger when you look at it, but eventually you have to look at it.
Amazing game, top marks from me.