This is cute!
I think it definitely has a lot of potential! I think it would be nice to add a sound effect when the player reaches population milestones.
Right now the game doesn't end after supposedly maxing out the map... apparently some tilespaces are not fully visible to the player (i.e. off-screen, underneath text), but are still clickable. I recommend making a more defined boundary to prevent this from happening in the future.
I'm definitely interested in seeing where you go with this!