>>713024350The interest comes in the form of intuiting which keywords ought to go together, and experimenting with the different outcomes, like Ace Attorney, in a way. In those games you test evidence against the testimony witnesses give. In this one, you'd pay attention to what the characters say, determine their dispositions to various topics, and construct your responses based on that.
Some combinations of keywords would result in unsolvable puzzle states, some would result in solvable states, but only provide more background information about the world or the characters living in it, and some would result in progressing the story, either in the intended direction, or towards a bad ending.