The gimmick of this puzzle is unorthodox and brilliant, but some players might have some trouble with it. Still, nice.
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Uhhh... the Treasure chest is on an Overhead layer?
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Forgot to take a shot, but you can actually get stuck on the top right corner when you're coming from the Activated Blue Direction Tiles from the north screen of this one. (Hopefully you understood what I meant). XD
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This puzzle is also a bit weird. A bit hard, but a small, yet, clever hint might help.
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And lastly, you really need to give a big hint in this room. I spent around half an hour playing with all of my items until I accidentally found it. It's better to hint it in some way but also keeping it a secret. A guessing game in this way isn't a good gameplay design choice.