On the title screen type the following:
"FAST AINT THE WORD"----------Infinite lives
"UNCLE SAMS"------------------Infinite lives
"ITS FAIRY BOWBELZ"-----------Infinite lives
"SHE LOVES CLEANING WINDOWS"--Infinite lives
"LIFE IS MY DREAM"------------Infinite lives
"MORTIMER"----------------F1-F5 select stage
"TURN FRAME"---------------1-5 selects level
"ESTRANO"-----------------------Lets you fly
(Use the 'LEFT SHIFT' key to toggle the above fly mode on and off)