What a beautiful game. The art and the music worked really well together. The biggest drawback for me was the UI. It wasn't too difficult to understand really, but one thing that I think could have helped would be if there was a line connecting what is related. For example, in the inventory screen, the trees across the bottom of the screen correspond to all of the materials in the column above it, so having a line drawn showing that they are related to that tree specifically would have made it easier for the player to keep track of the menu and look cleaner. If that makes sense. Kind of like how a lot of games have skill trees set up.
Character design was awesome, and the level design was nice too. All in all, it was a really relaxing experience, and I could see this getting fleshed out into a full game. Awesome job, keep it up!