questions in Undertale MULTIPLAYER

Use your imagination!
Are you able to fight monsters with other players?
(example, fighting froggit with 3 people)
A question this game will have a campaign as such as a story mode or will it only be exploration
why us can't play your game?
Will they add the power to create temporary teams as a '' party ''? Also, how would those who enter share the same monster to fight as in earthbound or will it serve to share the xp and gold that the monsters and bosses drop?