At the main menu, select the "Profiles" option, then choose "Create Profile" selection. Enter one of the following profile names to activate the corresponding cheat function:

Level select

Enter "HANS0L0" as a profile name to unlock all levels.

Refill health

Enter "B0BAF3T" as a profile name.

Level select and refill health

Enter "JD1MSTR" as a profile name.

When you have enemies around you, stand still and press Square to use Zeeo's shield. This will deflect the enemy's fire back to them.