All you need to really do is remix. Don't change anyone you're not beating up (besides Garfield), and things will be ok.
(Unrelated but god I miss when AYs were still a thing and non-FNF related.) Credit to Paws Inc. for Garfield Most of the sprites come from Garfield games. The Garfield sprites are modified versions of Garfield (NES-Style) by Miles The Duck on TSR. Music is Chemical Plant Zone from Sonic 2.