I liked this, that was clever. I will warn new players that you feel railroaded at a couple of points, but that's also deliberate.
I have some suggestions if you'd be willing to update this.
Favourite flower: a none option. For me, as a blind person, I've had no interest in flowers although there's smell of course which can work. But the good thing is you can just use imagination which is what I did, picking roses as it was the first thing I thought of, but a none would just make me feel more seen.
Other ideas for first date: theatre (broadway-esque or vegas-esque show), videogame, just chat.
Ideas for how this could fit a heartbreak:
Some answers could make you too extraverted, or intraverted, to the other lover. Essentially lack of balance.
I'm also wondering if there could be, whilst not a happier ending, a more simpler ending somehow where it'd just show that you're spending time away from each other. Again, it might have to be a specific path. But that might also not be the point of this, as the railroading is meant to make the player, I think, feel a little uneasy deliberately.
Also don't worry about the word watch, that's absolutely fine, watching the fireworks fits the verb of doing an activity, so if you change this, please, do not change that because as a blind person I use watch all the time, especially when talking about tv and yes, fireworks.
If it were me, I wouldn't have purchased anything for the person but chatted to figure out their personality and bond that way.
But perhaps the idea of this experience is to always end in heartbreak of some sort, hence it's description?