Dr. Chaos

LTKKVPZL Start with more energy
PPKKVPZU Start with less energy
AEEGUZLE Mega-jump
GXKIKIST Immune to damage
AKSSKIGP More invincibility time
GESSKIGP Less invincibility time
GZEYEEVK Infinite pistol bullets
OVKIKISV + PEKISIGY Take minimal damage
TVOSSITG + AEOSKIYA Take more damage and Shield Suit has no effect
PASKSPAA + ZISKNPLG Start with Shield Suit