the design must be good.
I think it needs a 3d touch... I mean like a 3d menu, 3d pictures in the game story, etc...
it also needs good music and sound effects, like a voice that comments everything, (I can make a robot voice)
I'm not worried about the gameplay, though.
With all our features this is gonna be a really challenging game.
Y'know it makes more fun when we have effects in it, like if u hit someone, he falls back, maybe against a tnt box, it explodes and your colorful shinig score appears in front of u.
It should make u feel powerful, the cause off mass destruction.
Then people won't wanna stop
Also important for our game is that there's always something happening.
When your rival flees and it's getting boring for u, there should drop some extra crates from the sky, making you able, to blast your way through to him (you know, in worms it can get really boring, your enemy sits in the cave, you don't have any drills and stuff, you just sit there and wait for sudden death...)