Very nice! I love the atmosphere that the adventurous music and fiery hellscape create. I like the combination of hazards you've created (especially that the platforms tip!), and that the positions/heights of the platforms seem to be randomised.
I did something slightly similar in one of my previous game jam entries, "Watch Your Step", except it was 2D, and the platforms got spaced out farther and farther as the player went on (but the player can grow a bunch of long legs to try to compensate), and I didn't add any hazards other than the platforms collapsing. Also, your graphics are waaay more immersive than mine were, and you gave the player a lot more control than I did. :D
My best score was 560, I kept timing my jumps either too early or too late, and missing the platforms. :') So I didn't actually run out of health because I didn't survive long enough to!
It's also nice to see a Unity game running completely in-browser! I need to learn how to do that sometime. Well done!