If you get the chance please do a how to play and I'll give it another go.
I did 3 or 4 laps around the map, even went back to the entrance, but couldn't find any more mobs.
In terms of what music, its very subjective and it should go with your theme, so my disliking it is probably not relevant.
Once I've completed the RPG Inventory course I'll be making the 1st person shooter from the 3D course and we can compare notes :)