Wow, this is cool. I wanted to do something like this but with bird flying and fish swimming under water. I had to ditch that, as I am not an artist. Really well done :)
Some characters are overpowered. I wish I had more time to play test and balance the game. With no engine redistributable, only 1 character and less variety of buildings, the packaged game is <150 MB, but I didn't go for that category.