Press P to pause the game and use the following cheats:
Full energy: booster
View ending sequence: just cut to the end
Level select:
Anything But Tangerines: fruit
Puppy Love: dublin
Flyin' Kin: hoffman
Cow Abduction: abrown
Hammerhead: mortificator
Iso 9000: blue
Door Chase: morrison
Level Ate: carlosr
Flamin' Yawn: gomba
See Jim Run: chase