Haha yeah, we wanted to put Flo Rida music in the game but didn't want to get copyright restrictions.
The pipes are green so the button matches the pipe rather than the player.
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So like @SkinnyP12 said, we wanted the buttons to match the pipe it turns on/off rather than the player's colour, so that's why the button on L1 is green, because it turns off the green pipe.
We actually did have a discussion about the colour of the button (green vs blue), and we could just as well have gone for blue, the gameplay would stay the same though.