Thank you!
This is a transcription of a piano arrangement from the PC sequel to an NES game.
So, my transcription is still directly from the PC game soundtrack, even though it is itself a piano arrangement of an NES theme.
How would this work?
I mean from the sounds of it if it is a piano song from a game they can submit this fine.
It really doesn't matter that the theme originated on the NES (example, see all the various Mario themes that were on the NES and now proliferate as new versions/remixes through games on the Wii, Switch, etc.).
The arrangement you have made, is by NSM standards, a song from a PC game and you would indicate the theme is from that PC game.
As I indicated in the screenshot I attached, if there's a different composer for the PC game than the original theme, than put it on your sheet the way it is shown in the screenshot.
To save further confusion, could you drop a link to this song you have arranged?