I really love the concept and the game is gorgeous! However, I must be an idiot cause even with the clue I have no idea what to do in the first room (can't figure out where the adaptor is). My only current critique is that when you pull objects that are plugged in, the slack on the cord makes it feel like you can take them further but there is an invisible force preventing you which feels bad.
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Overall, extremely cool game. I love the art style, the sounds are cool, the concept is cool. But, perhaps ease the player in a bit more. Simple, for dummies mechanics first, scaffold the harder concepts and make them piece them together gradually. I never would have figured that out if you hadn't mentioned it. In hindsight, I can now sort of see the clue you get with the black light, but without that added hint I never would have gotten it.