Half way through the game, I was REALLY tempted to press the blue button and claim my warm cookies. Two hours and tons of frustration later, I realized I should have just stuck with the warm cookies.
It's kinda lame that you can capture a level 21 guardian, but it still goes to level 6 if you are level 6. By the time you actually get to level 21, all of your other guardians are level 50. And it is a serious pain trying to level a guardian that much without becoming severely bored.
It would be cool if, after you defeat one of your opponent's guardians, a sign could come up showing what guardian they are bringing out next, along with the option to change your guardian with them.
 "Give Up"){kind=icon}
 "Axis Football League"){kind=icon}
 "SkullFace"){kind=icon}
 "Final Ninja"){kind=icon}
 "New Star Soccer"){kind=icon}
 "Downhill snowboard 3"){kind=icon}
 "Squishy"){kind=icon}
 "Mike Shadow: I paid for it!"){kind=icon}
 "Chat Room for fun"){kind=icon}
 "Circle Survivor"){kind=icon}
 "Into Space 2"){kind=icon}
 "Siegius Arena"){kind=icon}
 "Strike Force Heroes"){kind=icon}
 "Rogue Soul"){kind=icon}
 "Jacksmith"){kind=icon}
 "Mystic Guardians"){kind=icon}
 "Flood Runner 4"){kind=icon}
 "The Enchanted Cave"){kind=icon}