This game is absolutly stunning, awesome soundtrack, great visuals and it invoked a multitude of emotions during the gamplay.
But I found a way to get onto the water in the first level, if you look at my video at around 0:21:20 you realize that by going left from the bridge and onto the furthest mound possible, you can fall onto the water. Don't think it's on purpose, since you can't interact with anything, but thought I should bring it up anyways.