Really beautiful, evocating. You built a very sensitive world with this game, and I would love to see it expand.
The satisfaction you feel when turning on the mennir, to see nature get back to life, it's wonderful. Animations could be improved, mechanics could be polished, expanded upon, but my weirdest suggestion is this: Make the main character younger, or frailer. It may seems weird, but having her being less a warrior, and more a manifestation of fragile, pure and powerful nature would add a sensitive layer. With maybe an outfit covered in leaves, fragile flowers, bark armor, bine bracelets... I might do a lil' artwork to express it better.
Still, it is a wonderful concept, and I would be delighted to see it get bigger than it is.