Very creative idea!
Unfortunatelly, I'm stuck! I pulled out a pen a paper for this one (more like windows notepad lol but bare with me). I thought it was very clever to have q appear on the first sentence, as this is the once I picked. I than was use the letter x, q, z, but when I say we have to have a date to break the curse, the girl run away from me... It like real life all over again!
I read in the comments that you should stay silent some times, but then she say that if I don't have anything to say, she's going...I tried to help page in game as well, and probably missing something, but a walkthrough will be very nice, as I do want to see where this is going
In terms of the mechanics, I felt the sentences you can say are very long, and scanning for letter for later is daunting. I don't mind jotting down letters, but it could be nice if when she says "hi!", you can respond with "hi", "hello", "hey" and than you know you must keep the h, and you remember when a rate letter such as X is really needed (I think the name of the player characters starts with x, maybe you must say your name at some point). If I was on this situation I would speak on short words or sentences - this could be a cool dialog challenge and puzzle!
I liked the writing, art style and the idea, and will come for this one with a walkthrough!