It's a co-op top-down hack 'n slash, this game is pretty decent, it provides a good challenge when playing with a friend but would be pretty dull alone, the graphics for when it came out are actually pretty solid, and the music is pretty damn good for Digimon based game. The story is very forgettable and simple, you could ignore it and miss nothing, it could be told in one sentence. Overall a decent game, it could have been better but could have been worse too.
Fuck this game. The only thing good about it is the multiplayer because you get to feel the pain and suffering with friends. It's bad, repetitive, boring, grindy as fuck, it isn't long but it feels sluggish, it gets so boring it numbs your brain until you start drooling, and you want it to be good, because hey, it's Digimon World, let's fucking go, but no, no. It's trash.