Thank you for the recommendations, I’m going to check them out later! I’ve heard so many things about Superstition, it must be really good, a lot of people seem to like it.
Actually, I just realized something: The Adventures of Sherlock Holmes WIP also has a system similar to friendmance/rivalmance. OMG, how could I forget about it, I literally mentioned this game myself in this thread earlier 
We can’t really see how different versions of the same romance would feel just yet, because there are only three chapters for now and we still haven’t met two ROs, but the writer Doriana-Gray posted a mini romance guide on the tumblr, which explains how romance will work. Basically, you collect romance points and friendship points, and depending on their combinations, you can have a different type of relationships with RO - love, crush, bickering-love, etc.