Bosses do feel challenging, but never to a point of being impossible. My first encounter with a boss resulted in me eating pretty much all of my snacks for health. The more you explore, the more items you can find to assist in fights: it turns out there's a multitude of strong weapons out in the world. Once I figured that out, battles became a lot easier to succeed in.
Retrace the Light is a beautiful game. A vast variety of environments require completely different designs, and to be able to accomplish that whilst maintaining cohesion is impressive. Not only are the traversable areas a joy to admire, but the character designs are lovely too. The images of characters in conversation are colourful and bright, with an almost watercolour feel. It’s an interesting choice to put in such a technology focused game, but one I really like.