I found the key! I think you did a great job creating a surreal experience. I also really felt 'stuck' as I was trying to retrace my steps and get back to my room and somehow ending up in new worlds. I did come across several items in my play, but none seemed to do anything - not sure if there is something I was missing there. Great job creating such a unique experience with this format!
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Glad you had a surreal experience with Super Dream Domain! I don't think I made it very clear, but you can always wake yourself back up by pressing and holding the "4" key (or face button east on the game pad) which teleports you back to your room. There is also an auto-save feature, so you can always reload your browser if you get stuck, and you'll still have your key and items. You weren't missing anything really with the items. Most of the item interactions haven't been fully implemented yet, so currently only the Bow, Crowbar, Syringe, Sword, and Book have much of an effect (the first 4 are weapons, the book heals you over time). Glad you had a good time with it regardless! I'm planning to release an update later today with more item interactions, and a new level layout :)