Nice idea, I've always liked the look of these revolving worlds type of game ! It fits the theme perfectly !
I really like the way the buildings spawn, it's so satisfying ! ^^
I had a small issue where I couldn't strike and gather the resources if they are too close to a building (I assume they are on a layer in front of the resources, hence preventing the click from actually triggering the action).
With more developement it could end up as a nice little game !
Have a good one ! :)