Depending on which game you are actually playing, here is a quick overview of how to survive:
Extract the contents of your (the data files) and copy the entire not-a-hero folder to ux0:data/ .
(Optional) Use to overclock your device to 500Mhz for better performance. File Preparation : File: Not.A.Hero.zip ...
Install on your Vita if you haven't already.
: Ammo is scarce. Shoot enemies in the leg to stagger them, then follow up with a melee punch to save bullets. Depending on which game you are actually playing,
Install the (game launcher) through VitaDB or the GitHub release page . Game Guides
: Beating the game on Professional Mode unlocks Infinite Ammo for subsequent runs. File: Not.A.Hero.zip ...
You need the official of the game (the .apk file).