Reboot (PSX)

Flying:
At the main menu, press Left, Down, Right, Left, Up, R2, L1, Up, Left, Right.

Free Shield with Every Glitch Pickup:
At the main menu press Down, R1, Left, Right, Down, L2, R2, Left, Right, Up.

Full Glitch Energy:
At the main menu press Right, L1, Up, Right, Down, L1, R1, Up, Down, Left.

Max Out All Weapons:
At the main menu press Up, L1, Down, Up, Left, R1, L2, Down, Left, Right.

Play as Dot:
At the main menu press Left, R1, Right, Up, Down, R2, L1, Right, Up, Down.

Play as Enzo:
At the main menu press Up, Left, Down, Left, Down, L1, R1, Right, Down, Right, then start a new game