The first time I played the game I pressed the buttons in the order (2, 3, 1) and this gave a weird ending, that for me not really make sense. Then I pressed buttons in the order (1,2,3) and it gave a much more interesting ending.
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When I pressed the last button (Button 1 ) I stayed on beach world, but the world got some really dark and strange colours. I could wake around in this world, and I could also change worlds, but all the worlds had the same strange dark colour. Perhaps it just were the the spaceship level that did not load.
I am not sure, but I believe that there are two different transitions from the beach world to winter world. I believe that in first transition it just gets cold and here you can walk over to the button 1 with no issues. But there is also a second transition that is much colder and where you get killed if you walked around in it for too long. I am not sure, but perhaps I walked over to the button 1 in the second transition, and reach the button before it was Game Over, and then it perhaps got a issue because then was Game Over and should transition to the spaceship world at same time.