Enter these in the ‘Cheat Menu’:

 JFFSPNGDNBRG  	INFINITE LIVES HTSDNM		GALLERY LRNMSNHR	SHOW CREDITS MGRLSGTM  	ALL WEAPONS RHNSRLL 	UNLIMITED AMMO MBRNKLSN  	SPIRIT MODE HFLLTHSH 	TINY ENEMY PRMSHN 		BIG HEADS LLSNMRTN	INVINCIBILITY BGGNTSS 	DISCO MODE PTLFGNDS 	LEVEL 1 WARP QTMBGS 		LEVEL 2 WARP GTMNDSBF 	LEVEL 3 WARP NCPGHM 		LEVEL 4 WARP RSTPDFRPL	LEVEL 5 WARP BGRSD		LEVEL 6 WARP NBCD		LEVEL 7 WARP LFRRSPR		LEVEL 8 WARP CRCDND		LONGHUNTER WARP CTNTSCND	MANTIS WARP THSFNDNT	TREX WARP HSTSMN		CAMPAIGNER WARP TRNTNNQ		ALL MAP KNTSFSKS	FLY MODE CRLSFNDNGS	PURDY COLORS DGHTTSRS	ALL KEYS TKMDKK		SHOW ENEMIES GSRCGKFS	QUACK MODE 

Thanks to Revolution readers Kauza and Jimmy Tjörnvik!