There were some bugs but I can forgive them because the concept was amazing.
I'm sad that it was so short though. I really wanted to play more and that's the best complaint one can receive. Really good work!
At like the fourth or fifth level the game freezed for a while and then I couldn't control my character. I could just reset the level. Then something happened and I saw the door of the first level and the fifth level. Also the tutorial text from the first level. Then after that I could continue, but at the left of the stage there always were two doors. I can't really explain it better and I'm not that sure about the details.