I'm not sure you got the theme at all? I didn't see a single gun cat or any microscopic worlds. Additionally, gameplay is very confusing, and it is very laggy. But if it is an actual working MO, that is ridiculously impressive to be made in 3 days :O
I do recommend maybe not having a large scale game for a quick game jam, since the central core gameplay suffers from it, but still good job man :)