As Mike have not finished his work on the game's sound support just yet, I took the liberty of changing the ambiance and music related parameters in World.ini files a bit, for the better. I hope this is ok.
I've now started to work on improving the Mountain world to include the tutorial I mentioned before. I think I'm going to adjust the colors on the background and text. The only thing you can see of it right now is on the third level, in Normal mode.
I have to go make "Mario Fireball" cookies now.