Thank you ! Space on screen has been a problem during development, as I wanted the player to the see far above him, while he also needed to see the lava below. A thing I could have tried is moving a bit the camera depending on where you aim, which would probably help, mostly when using the mouse indeed.
About the music bug, I realized it too late, and got a little frustrated that I had no time to fix it, but it will be done :D