Beating Undertale might take around 6-10 hours, depending on how long you mess around and what-not. There are also three different main ending paths to take:
- Pacifist - Not killing a single enemy and finishing the neutral ending (an extension of Neutral)
- Genocide - killing absolutely everything
- Neutral - as long as it's not Genocide
All trophies can be obtained on any of these three paths, but because the game was designed in a way that genocide route endings affect pacifist endings from there on out, it's recommended you play a neutral/pacifist route first. The culture around Undertale suggests not telling people how to play the game, but the fact that doing a genocide route first would mess things up in the future taints this ideology. The game is just not meant to be played however you feel like it, despite the trailers and conversations about it.
That being said, the genocide route is incredibly hard to finish, so it might not be likely that you'd end up finishing a genocide playthrough first anyway. That just means it's more worth your time to play as a pacifist first.
Undertale is not a complicated game. It doesn't even use the L and R shoulder buttons, and only uses three of the face buttons. The way battles work may require more precise movements, so the is worth trying out. That's kind of all there is to say for things you'd be better off knowing ahead of time.
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