You need only 70 points on any interest to start building a relationship with people of that group, after you have collected that many points when you talk to that people, their message changes and they give you friendship points.
First change on relationships is after around 20 talkings.
Money is not useful in this build, planned to buy upgrades, clothes and books to make relationship build easier. As the Jam date was near i could not finish some ideas i had when i wrote the design document.
I hope to do an upgrade later on adding those changes.
Thank you for playing and for your comments.