While not officially on the App Store, the game has been unofficially wrapped for mobile devices using the PC assets.
While there are no official system requirements for a PSP ISO of Hollow Knight, here are the minimum and recommended system requirements for the PC version:
If you’ve landed on this page searching for you are likely a fan of two things: the masterpiece of 2D action-adventure gaming from Team Cherry, and Sony’s legendary handheld, the PlayStation Portable (PSP). The idea is tantalizing: playing the sprawling, bug-infested kingdoms of Hallownest on that crisp 4.3-inch screen, using the classic PSP button layout.
These are the modern kings of handheld gaming. The Steam Deck runs the PC version of Hollow Knight perfectly, with full mod support (custom skins, randomizers, Pale Court mods). If you have the budget, this is the ultimate Hallownest mobile machine.
Prank files that simply play a trailer of the game.