In the early hours of game-jam I was also thinking of making something like this with proper mechanics but scraped out that idea due to time limitation art style is very good it has a lot of potential, You can even make it into a mobile game with this much elegant graphics and proper mechanics (Some I though for this jam were giving scores based on how neatly player formed city) This idea is very very similar to me All the verybest I will sugest you continue to work on this
Also do rate my game :)