Good effort! I didn't rage as much. Once I got used to movement and jumping, I was able to go very far without taking damage.
The jumping is a bit weird, if you jump too soon when you start moving, you don't go as far. But if you're going for a rage game, then it works :D
Also, the player collider might be a bit too low, sometimes I felt I didn't even touch the lava and I took damage. Occasionally, touching the lava skyrockets you up in the sky, it was fun so I'd consider it a feature xD And music and sound would be an awesome addition!