The art design is great. Everything feels cohesive, the plot was nice and tight. Of course, I'm a sucker for guitar anything. She looks like she's using either a Tele or Mustang or something, so that harder edged, almost 90's music works well here. That death hit with the delay is a great idea. Loved the continue from the same area business! Not having to go through the same places several times is a blessing!
Only thing I'd want is maybe a bit more precise movement. I died at that first lave jump a number of times and during the final boss I found it hard to not slide right into the flame column attacks sometimes. Well, maybe I just suck at it, haha!
Great work, though!