A wonderful game.
I enjoyed the writing, it's very charming.
I LOVE the art style, and the art of the game. I don't know why you went with pixel art for the UI and the dialog boxes though.
Although I've seen this exact life <-> something exchange mechanic in a lot of entries, the connection to the secondary characters make it feel more impactful and meaningful. I also love how there are a few different "build" options you can go for.
I played it through twice, and I got the bosses we're in a different order the second time, and if that's intentional, then it is very welcome, from my part.
A few gripes though. Some hitboxes are off, and the bosses are generally easy to cheese. But other than that, a very well made game!