This is a really good start and I can tell with those 15 minutes that it has a lot of potential! Especially for your first game, this is super impressive!
The storytelling is great, love that mix of serious and wholesome. The combat system seems interesting and not too hard to grasp, I hope the difficulty won't come from them being too RNG based.
I don't know if you already have the story and general content in mind, or if you're going with the flow, but try to plan ahead what you want in your game and stick to it. Many devs fall in the pitfall of implementing every cool ideas they have, and they end up with way too much work (especially when you work alone!).
Best of luck and I can't wait to see what you have in store!