I wouldn't call it fun, but I would call it simple. It took a bit to understand what you meant by lose money for the one medal. I assume that it meant to let it fail off the screen, which I was right.
It needed more. After you make all the upgrades and get the medals in 2-3 minutes all interest in this game goes away. Its extremely easy and presents little to no challenge.
Perhaps for a young child this would be fun.