Enter these cheats under secrets after pausing:

Wish - Code

Big heads - EINSTEINIUM
Destroys everything in surroundings - SMARTBOMB
Eye lasers - GAZERBEAM
Fire trail - ATHLETESFOOT
Infinite incredipower for Elastigirl - FLEXIBLE
Infinite incredipower for Mr. Incredible - SHOWTIME
One hit kills - KRONOS
Restore 25% health - UUDDLRLRBAS
Small heads - DEVOLVE
Speed up gameplay - SASSMODE
Infinite incredi-power, Dash - DASHLIKES
Infinite incredi-power, Violet - TONYLOAF
Run Fast - DANIELTHEFLASH
Slow Motion - BWTHEMOVIE
Change Camera X - INVERTCAMERAX
Change Camera Y - INVERTCAMERAY
Constant Health - PINKSLIP
Easier Gameplay - BOAPLACE
Toggle HUD - BHUD
Change Brightness - EMODE
Crazy Colors - DISCORULES
Play Intro - HI
Credits - YOURNAMEINLIGHTS