I'm conflicted about how to rate this for Authenticity, I really like what you've done here, using the same amount of pixels in 64x64 but shifting it to something like 70x52 for a nicer screen shape, but I was explicitly told I wasn't allowed to do this when I asked at the start of the jam.
That aside, I liked exploring the worlds even though they are mostly empty, they have a nice ethereal feel to them and the colours are interesting and varied between the different worlds. I'd love to be able to explore worlds like these with some simple puzzles or story mechanics that would be great. Nice work.