I had a really hard time with this one. Since I had no indication of where each door would take me, or where I needed to go in the first place, I found myself just wandering around trying to find the last key while spamming 'space' as fast as I could. I really like the idea behind the "it's not real" theme, but I think changing the space mechanic to be something different (ghost get's too close, or starts making sounds) would make it much easier to play though the game. I had to give up when my arm got tired :(
The sound gave a good ambiance to the game though, and I love the pixel art :)