Not exactly, no, there is also writing a story, posing, animations, and set design all in Studio NEO, map making, UI design, and more. That said, it's not rocket science either, so hey, go for it, we can never have too many people making games. I am working on a few myself, though not in ren'py. It can help to have a team to make help keep you focused and balance your shortcomings (whatever they might be), but some of the best games on the site are teams of one, so it can work either way.Making these games are really easy, isn't it? You just need to use renpy and honey select and a bit of simple coding.