It depends mostly, I listened to your composition and I would consider it original enough to be its own thing! I would say I pay attention most to how exact the melodies when deciding. So something like route 1 in GSC I would consider a remix of route 1 RBY. It's hard to really draw a line for this so I'll tend to give benefit of the doubt, since the primary reason I made this rule was to incentivize the researching/analyzing part of imitation and to prevent situations where an artist might use a significant portion of another song without understanding why it sounds like Pokemon. In the future, I will try to see if I can come up with a more clear criteria for what I would count as a "remix"