As of right now, max you can get on most characters is 3-4 hearts. I think that's because the game is not finished and you'll only get to max hearts once you get to the end of the game with all/most correct choices
True, honestly it's a really fum fuckin game, chop chop and chang are the best lol.
one more question, when you get back from the trip with lunas dad should you pick fishing sim or something else when she texts you?