This game is really cute and fun! I think it'd make a good mobile game (if you wanted to go that route). Are there plans to add a way to "win" the game?
It makes me a little sad to see the frog fired over and over lol
My first thought on how to "win" would probably be getting enough points so that the frog gets a promotion! Alternatively, promotions could be tied to stages with ramping up difficulty (if you wanted to make multiple stages). Maybe after the player gets enough promotions, the frog rules the postal services lol.
That being said, I think the game is great as is!