One of the best game I've played in this jam ;-). I loved the black & white minimal artwork and audio, this made a strong impression on me. It's a world I would like to explore more, it's intriguing and I feel it could turn into hours of gameplay, improving on "what's behind that door" and "how are all these micro worlds related in the big world ?".
(someone mentioned Manifold garden, I don't know that one, maybe I have to check since I liked your game)
Some drawbacks :
- the level design could be improved
- camera issue : in fullscreen you see way farther than in small screen
- the biggest drawback I had was that the "F" key often did not work, I had troubles entering doors.