Enter these cheats under secrets after pausing:

Destroys everything in surroundings: SMARTBOMB
Speed up gameplay: SASSMODE
Restore 25% health: UUDDLRLRBAS
One hit kills: KRONOS
Eye lasers: GAZERBEAM
Infinite incredi-power for Elastigirl: FLEXIBLE
Infinite incredi-power for Mr. Incredible: SHOWTIME
Fire trail: ATHLETESFOOT
Big heads: EINSTEINIUM
Small heads: DEVOLVE