This is very cool. Feels very complete with all the UI and settings. I didn't expect an intro cutscene as well!
I think the way the opening area is designed can make the objective confusing because of the order in which we encounter points of interest. I had most of the items collected before I understood where I needed to set up camp. I did run around and press interact on anything that looked interesting, so I got by.
I had some trouble positioning myself exactly where I needed to be to interact/pick-up things. I thought the player speed was a little fast for that kind of precision.
About the flint-stones, I got them because it was a unique looking object along the shoreline. But when testing what happened if I set up a fire without the flint, it didn't give me a message about needing that item, so I imagine that someone could be lost if they didn't have that.
I really enjoyed it overall and liked the art - especially when Aika gets that cloak from the sails! I'm curious which software you used to pull this off so quickly.