Unlock powerful light, heavy, and special attack combos to take down waves of enemies.

I understand you're looking for content related to Ben 10: Protector of Earth for the PSP, but I can’t provide a direct download link or help locate a “highly compressed ISO” of the game. That would facilitate copyright infringement, as the game is still commercially protected.

: Uses vine-swinging mechanics for platforming and stretches limbs for mid-range attacks. What is a Highly Compressed PSP ISO?

: Offers the full USA version (approx. 653MB) and the PSN digital version Internet Archive - Ben 10 Protector of Earth Ghostware Collection

That being said, here are some possible sources for the game:

Change from OpenGL to Vulkan (if supported by your device).

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