In addition to the main story campaign there are two more modes: survival and challenge. (relevant-gaming.com)
In addition to the main story line there are time trials for each level where you can compete against your friends to see who can complete levels the fastest. (andymerrill.com)
In addition to the main story stages, there are also a handful of bonus stages that are unlocked as you get perfect scores on the higher difficulty levels. (zeboyd.com)