Awesome art style! I really like the dark imagery throughout the world and the Don't Starve kind of style for the character. The music was subtle but set the tone really well.
For games with platforming, getting a good character controller is hard, but incredibly important. The character was pretty floaty and the hang time felt like he was flying lol. And the sticking to walls in the beginning before wall jump felt a bit weird.
Overall it was really solid, cool design, and I'd love to see a more fleshed out version of it!