What did you expect? Well, something like: "CONGRATULATIONS, you are the best, you have fully upgraded everything! err.. wait, that was upgrade complete, ok... black screen?"
If you're having trouble getting the hard badge, try pausing the game when you get to the goal, the next stage will load without you having to lose 2 seconds
 "Insectonator"){kind=icon}
 "Downgrade Complete"){kind=icon}
 "This is the Only Level"){kind=icon}
 "Tasty Planet"){kind=icon}
 "Storm the House 3"){kind=icon}
 "Pel"){kind=icon}