I got stuck and there was no reset option. :D I love the style and feel. I'm still in the process of playing the game.
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It was a door I opened at the very start of the game with my shadow-self and stepped into. Your intention implicitly was that I open the door with the real self and step in with the shadow self but I did the opposite and then the real self got stuck inside. Since it happened early in the game I simply restarted. You did good work on the platforming gameplay. I was impressed and enjoyed. It was hard and fun.