I loved this. The art style and premise immediately got me into it. The game feels like something the characters in Smiling Friends would play. Using an electric guitar cover of Flight of the Bumblebee was very clever.
I felt like I had some minor issues with the controls. Sometimes I'd press spacebar and the character didn't jump. The falling platforms are fun, I think it would feel a little better if there was a rumble tween before they actually started to fall. Dying was still pretty fun with the animations though, and I appreciated the ability to restart things quickly.
The 3D textures blended nicely with the pixel art, although the texture resolution could be a smidge higher to smooth it out a bit. They also might blend better unshaded or with toon shading to give a flatter appearance.
Overall really awesome entry.