Highly enjoyable bit of cheeky humour! I especially loved how quickly and easily Johnny died from the get go - the scant couple seconds at the beginning really made you want to laugh and punch the developer at the same time! Kudos on balancing the game upgrades with the level design - albeit short.
I disagree with some others that there should have been much more upgrades - those would probably "break" the level design as it were - an alternative is to implement other types of upgrades in a sequel or in a "different campaign" with a different hero?
Good job!
 "Johnny Upgrade"){kind=icon}
 "Toy Tank Defense"){kind=icon}