The keyword includes "highly compressed." In the emulation world, compression is real (CSO files versus ISO files), but there are limits.
: Be extremely cautious of "highly compressed" files (e.g., claiming to be 500MB when the original PS3 game is roughly 34GB ). These are frequently used to distribute harmful software. Real God of War Games You Can Play on Android The keyword includes "highly compressed
While many online sources claim to offer a "highly compressed" PSP ISO for Android, it is important to clarify that God of War: Ascension was never released for the PSP (PlayStation Portable) . Real God of War Games You Can Play
If you are looking to play God of War on Android using the PPSSPP emulator, there are two legitimate titles actually developed for the PSP: God of War: Ascension - RPCS3 Wiki The Reality Check
Since you are looking for a compressed experience, the PSP versions are naturally much smaller (usually 1GB–1.5GB) than console games.
Your storage space vanished as the file "expanded" miraculously. The Reality Check