guys, there's something aloof here. the devs might have wanted to make this game more difficult by making purchases only available in each world.
nothing wrong about it, its necessarily something wrong with how the game is made but what makes it challenging about it.
 "Desktop TD Pro")
 "Shadow Snake 3")
 "Dillo Hills")
 "Escape the Red Giant")
 "Protector IV")
 "Hack Slash Crawl")
 "Epic Battle Fantasy 3")
 "Snail")
 "Mass Attack")
 "Tower of Greed"){kind=icon}
 "Desktop Tower Defense 1.5")
 "Chibi Knight"){kind=icon}
 "Particles"){kind=icon}
 "Canabalt")
 "Elona Shooter")
 "Smoking Kills")
 "Obechi")
 "Sonny 2")