Nice little 3d platformer, solid obstacle and level design. Overall I like the aesthetic you're going for and the sound effects add a lot. The enemy explosion animation was satisfying as well. I also liked the shift to a 2d perspective in the mountain level.
For some specific criticism on the actual platforming physics, I didn't like that the character takes some time to build up speed from a stop, it felt muddy and slowed the pace considerably. I thought the jump was a little too high and floaty and made it too easy to skip over obstacles on the ground. In addition, I thought the camera perspective when jumping needs work, I never had a ton of confidence on where I was going to land because the camera was too high in the air and the shadow (which you can't really see at the peak of your jump because of the camera) did not help gauge where you were.
One other thing I think could be improved is the attack, it has a really short range and didn't feel that great to perform. If the character moved forward and the hitbox was more pronounced I think it would add a lot to the feeling.