The difference here is how goddamn insane some of these are. Check out nausea heroes' storyline:
"Plants had win againest zombies last time…After a celebration party, all plants went to a holiday! But In the dark, zombie duck and Dr.zombie had signed a secret agreement. A whole new round of zombie invasion will begin when plants left. Nausea Heroes is the only hope for human as plants are not at home!"
About on par with Game King, IMO.
The game itself is pretty wild too. You walk around and fire bodily waste at enemies, including a machine that pumps poo from your ass. You can also summon various maplestory(?) animals and REAL PEOPLE that act as attackers and barriers.