I loved the art + music and liked the concept quite a lot, particularly for a first effort at making a game, but I found it a little too easy to get the true ending. Easy might not be the right word, exactly. It was the second ending I saw after the quick headpetting bad end, so it felt like I was missing a lot of context for the reveals. Still liked it, but maybe there's a way to lock a particular ending until you've seen certain key points of the story? (I've played other VNs that do this, not sure if Ren'py specifically allows for it.)
Not trying to be harsh at all, I'm not experienced with Ren'py either, but I thought it could be useful feedback. Overall I liked it a lot and I'm interested in seeing what you make in the future!