I absolutely loved this. There was clearly a lot of care and creativity put into this. I spent hours playing it and...almost...unlocked all of the special content. I streamed this process in my video below...
My one complaint is that the current version of the game continually tries to open SteamVR when I launch it. It's apparently a common Unreal Engine bug, and can easily be fixed by unchecking a box in the plugins menu from the editor
SPOILERS
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I was not able to fully complete the game, because apparently my save file became stuck. I found all 4 secret switches, but the game only responded to me flipping the orange and yellow ones. No matter what order I flipped them all it only responded to 2 of the 4. I even fully completed the red room and all the linked videos with the morse code. You can see what happened in my video: