Super Gravity Balls

CheatMode:
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Hold C+R+X at the menu for a secret game.
Hit F5-F8 while playing for extra cheats
F5 - Ends current wave of balls. The next wave
    counts towards the next levelup so abusing
    this cheat is unwise.
F6 - Refill zaps
F7 - Level up
F8 - Add power-up
Submitted by: Conner54