The first thing that struck me is how expressive the art is, with only a few images you managed really set a mood and have unique characters that stand out from the rest. I think you could really lean on that notebook / handdrawn aesthetic to have the UI and background be more pleasing, right now they're a bit bland (maybe you can split the fight in 3 parts, one for each enemy, and for each new one you turn the page?). The overall theme and message is very wholesome.
I think the main thing that could be eventually improved is just making the game more "gamey", right now it almost feels like a visual novel. Maybe there could be an incentive for choosing a specific message? Right now I felt like you could just click and do whatever, as long as you're switching up friends things were okay. So introducing things that force you to think more about your words would be great.