There's barely anything here.
This flash is, to put it simply, very lacking. One thing in particular it lacks is an inventory screen; there's nothing to keep track of what you've already picked up.
Second, there's no music or sound effects; these can be a big help in getting the player immersed in the game.
Having puzzles solved automatically was a bad decision. It would be better if the player had to choose to use inventory items, rather than having the game simply make the decision for the player when necessary.
It's also way too short; good escape-the-room games are much more elaborate than this.