I absolutely loved every second of this. The concept is really cute, the progression is simple but rewarding, and the visuals and overall atmosphere are amazing. It somehow made me feel nostalgic for something I've never even experienced before. I love the variety of spells and how they're used, and it was fun seeing all the icons in the top right slowly light up.
The only complaint I have, and it's a pretty small one too, is that the trees' shadows sometimes make it hard to tell where you're going, especially when you're in the water. There were a few times where I got my boat stuck up against a wall under a shadow and couldn't quite tell which way I needed to turn to get out.
Overall though, this was a really great time. I'd love to see a full length game in this same style.