Little Big Planet really needs some enemies and bosses
Funny... could have sworn the game had enemies already. And bosses. Like the Skulldozer (technically the first boss, though you really don't defeat it like all the later ones), Sheriff Zapata, Ze Dude and his goons, the Terrible Oni... Almost each area after the first two (the Gardens and the Savannah) have a boss, and after the first you start running across enemies you can kill (not just ghosts like the last part of the Gardens) by jumping on bubbles on their forms until they fall and fade away. For most, these are on the top of the enemies, so it's like Mario and jumping on Goomba heads.
Oh, and also, you apparently don't know you can smack your sackperson friends around by waving the arms fast enough. Stand next to someone and hold down the appropriate arm movement button, then instantly snap the stick at them- if done right, the character's arm will swing out quick enough that any sackperson standing next to them will get b****-slapped and yours should shake their arm in reaction to the impact. If no player is there, then the arm will just swing wide and nearly throw your guy off-balance.
Really, though, some of the best stuff was when they started giving you EXPLOSIVES to play with. Blowing things up makes everything better.