When I was writing my own NES game I found the annotated SMB assembly to be quite informative.

Also, many of the Capcom games used the same basic engine for rendering backgrounds. I modeled my background tile renderer after Ducktales’.

This kind of work really is invaluable.

Do you have a link to the NES game you made? Always interested in checking these out.

I don’t, but I have a link to a post I wrote about it: https://aaroneiche.com/2020/12/30/i-wrote-a-nintendo-game/

For all mega man fans you should be aware of this band

https://open.spotify.com/artist/2rVDi66o7gdeUq1OHUzM0W

The Protomen. https://theprotomen.bandcamp.com/

This guy has a great youtube channel also

https://youtube.com/@Bisqwit/videos

I'd be very interested in a package up of mega man 2 with all levels from all games. For those of you that never played any mega man games, all games from mega man 2 onwards until the X games were basically the same game with new levels and bosses.