Wow, a 3D game made in 48 hours with a lot of details, that's a feat that's not easy to overcome. Really good job on this game, I loved the music, the aesthetic was pretty good, the ending was satisfying, and the sounds were relaxing. There were a few minor issues, some completely understandable such as a few collision issues on rocks (some had no collision, and some were hard to navigate on). I also was confused a bit over what I needed to do, or where to go, but the level design did manage to direct me after a little while.
Overall, again I'm really proud of how this game was made just within those 48 hours. I really hope you continue working on the game by polishing it off and maybe adding a bit of a longer experience.