I also had a chance to play this game when the down key meant death, and though it made the game unplayable, I still had a blast and laughed a whole bunch. The controls would stop working quite a lot, like pressing Enter wouldn't bring up the Inventory menu and so forth, sometimes the menu would not show the Inventory with the <- arrow, and I couldn't use any points to upgrade my character. I will play again with your updates and see how it goes then!
It was cool to scroll through the levels with the secret button, too. I am absolutely amazed at how many levels you managed to put in this in 2 days. A really, really beautiful game, and I look forward to playing it again with the updates!
UPDATE: Much better now that the down key issue is fixed! I still found myself getting lost with the controls (not sure how to upgrade the character either), but it is very challenging and again, very very beautiful.