Hey, sorry for the late reply! So sorry I didn't do a good job guiding the player. One of the themes of this Jam is basically "it's been there all along" and so the key is right where you left it, albeit, magically appearing on the other side. I hope that gives you enough of a hint, and if you have any ideas on how I could improve guiding the player to those important objectives, I would love to hear them!
Also, I cannot thank you enough for posting a video of your playthrough! That information is invaluable, and just fun to watch! (even if it does hurt a little to see how dumb my design was. xD)