If you want a genuine God of War experience on the PPSSPP emulator, you should download the two titles actually designed for the PlayStation Portable:
If you find a file labeled "God of War Ascension PPSSPP ISO," it is almost certainly one of the following: god of war ascension ppsspp
Focuses on Kratos' search for his brother, Deimos. How to Play the Real God of War: Ascension on PC If you want a genuine God of War