Most often, these are "reskins" of God of War: Ghost of Sparta or God of War: Chains of Olympus . Modders change the textures, menus, and sometimes Kratos's model to look like the Ascension version, but the gameplay and levels remain from the older PSP games.

To avoid lag and get "better" performance, use these optimized settings: Graphics Backend if your device supports it; otherwise, use OpenGL. Rendering Resolution

If you want the game to look "Better" than a standard PSP, adjust these settings inside the app:

These games are optimized for handheld play and will run smoothly on most modern Android devices: God of War: Ghost of Sparta

If your goal is to use the emulator specifically, you should download the two titles actually released for the PSP: God of War: Chains of Olympus God of War: Ghost of Sparta Optimization Tips for PPSSPP (PSP Games)

Which emulator should I use to play the old God of War games?