That tune is from the SNES version of Dungeon Master. (The best version by far, in my opinion.) I used Zsnes to rip the music out of it, then converted it into a usable format. Unfortunately, you can't see the walls in any SNES emulator, because of the lack of DSP2 chip emulation.

Oh, I also know about that negative HP "bug"; I haven't bothered to implement death routines yet. Also, did you noticed that slamming into walls from the back injures the front characters? ~_^
Expect that to be fixed in the next version, as well as newer dungeon graphics. As a bit of a teaser, here's a sample of what the new walls will look like: