Some very cool concepts going on here and I love the setting and atmosphere you've created. The moment when you wall jump against yourself is really cool. My brain didn't handle the reversed controls of the mirrored character very well and muscle memory had me jumping me into walls and spikes repeatedly haha. The wall jump feels a bit too sticky and got in the way more than it helped, so there's probably some tuning to be done there. I loved the mirror visuals and sound when you touch the threshold - it sells it very well. Great job overall!