I purchased the app a few weeks ago and find it to be very entertaining. The story is simple but engaging. Positive dice roll outcome is rewarding although, at times I felt that a negative dice roll on crucial spots would ruin the game experience for me later on, so it is a mix of good luck and "correct" decision making. I also felt that no matter how many times I tried different decision paths some outcomes were inevitable. I havent finished the book yet and I am playing it bookworm mode which is fairly enjoyable. This is a gamebook adventure worth of purchasing!!
Raul_2012 about GA2: The Siege of the Necromancer, v4.0