Just saw the .99 sale and decided to try it out. Wow! I'm really impressed - far more than I thought I would be. I'm huge Fighting Fantasy/Fabled Lands/Middle Earth Quest fan and I must say that Catacombs of Undercity is easily one of the better game books I've ever read. I was very impressed with the length -seems to be about twice the length of a Fighting Fantasy book. I'll definitely be buying some of the others.
Have you ever thought of printing physical copies? Would absolutely buy.
Keep up the great work!