Sorry for late reply, but does the direction matter? I go through the right door 3 times, knock and then so on so forth. But it still doesn't work.
Lmao I forgot about this game after giving up on the first puzzle but I just came back to it and finished it in one go. Honestly, the one I had the most trouble on was the first one, since the key is at the top of the page I thought the directions were going from bottom to top. Bit of a confusing first puzzle but overall pretty good game. Nice job.