The point system is actually used several times in the game and unlocks specific options.
The game is indeed not finished. It's just slightly more than halfway done. There are 18 different paths in the game. a majority of which leads to more than a "peck and a hug". You probably avoided them. And being kind doesn't mean they're into you.
However, you are right: Summer Scent isn't a fap game. If you're in for a quick solitary pleasure, you will be disappointed.
About the colour of Luke and Ray's skins. It has no meaning to me. Black is no different than white, blue, green or whatever. If you see something else in it, maybe the problems lie elsewhere. If you play the game, you will discover that they are more than simply "2 large black men as rapists".