At any point in the game, Hold Left-Shift and Right-Click while entering the following codes:
NOTE: "B3" means you have to press the mouse scroll-wheel button in.
|X, X, F, E, TAB, F||Get every Psychic Power|
|TAB, E, E, X, SPACE, B3||Infinite Lives|
|B3, SPACE, TAB, TAB, F, X||Infinite Psi Blast|
|SPACE, B3, B3, E, F, Left-Click||Infinite Arrowheads|
|B3, X, E, E, TAB, F||Global Items|
|TAB, B3, TAB, E, X, E||100 Rank|
Thanks to Revolution readers Ariel_Doom, TheLateApollo, and ~~fluid~~!