One thing I would ask the developer is what's the point of being able to score relationship points with characters that you can't even have relationships with?
Just try to make an VN yourself. You'll see pretty fast why devs implement point systems. In this way, you can depict different behaviors between the characters based on their affection for each other. Take Emily, for example: with a positive score, she buys a motorcycle for MC's birthday; with a bad score, she is more indifferent to the long-past birthday.
Normally, we as players don't know anything about the points, so we don't care how a dev programs. We only know because of decompiling the game (and sometimes Nyx making the mistake leaking her own code with update fixes). Somehow you have to build in variables if you don't want a kinetic novel, but an AVN based on decisions. So that's the point of scoring points.