Pretty linear plot
Even though there are supposed to be over 1000 endings, I don't see them being that different than each other. There are just many places you can fail and die accidentally, but it's not that hard to press four buttons and have people live most of the way through. There are only a couple of places where your decisions will have a huge impact on what happens, and it's mostly if a character will live or die, not what happens afterwards. It's not really the Butterfly Effect if the only thing that changes are character deaths, not big events that unlock new areas, or interact with characters you wouldn't have otherwise.
That's why this game seems to work better as an 'interactive' movie more than a game. There's not much you are doing. There are only certain paths you can take and the game pretty much forces you to take certain actions to move forward.
That doesn't mean it wasn't enjoyable to watch - but it's really lacking any sort of branching with decisions.