Oh the good old DOOM 3D controls!
It would have played better with strafe + mouse look I think!
One thing: use AudiostreamPlayer node, and not AudiostreamPlayer3D for music. With headphones it was super weird how the music was suddenly only in one ear.
Nice environment, it was a bit hard to understand where I should be heading. Didn't make it to the top sadly :)
Hope you had a good time making it!