Yeah, I think if you wanted the story to have a natural pace it'd essentially need to be twice as long. Most of the new content would be after the "confession" and there'd be significant turmoil before it resolved.
The main thing is that the protagonist would as depicted probably be utterly destroyed if things didn't go well and writing that would make the story even heavier, so I'd probably need to flesh her out further by balancing her emotions and sort of moving her anxiety and loneliness to a back row, where it's less all-consuming and more gradual, that way she'd appear more resilient to disaster. Problem with that is she'd probably be less sympathetic and take more time to become so, in order for the climax to hit her more, which again would make it longer!
These are all kind of excuses for the story not being long or elaborate enough, but I can just blame the game jam for that, which is easier than blaming me playing videogames instead of writing 👍 Glad you enjoyed it anyway!