So as several of you probably already know its super easy to make mods for this game, however I was wondering how far we're allowed to go with mods before our run gets rejected, for example I have a custom tileset mod that changes the CGA pink to CGA red and I hope that won't be banned as I really like it. And in future if I'm allowed I'd like to make some purely visual changes, no additions just changes, to Cap's sprite and possibly the WIN orb. I do hope mods aren't banned so long as they don't give the player an edge over anyone else.

I think as long as it does not drastically change the sprite at all, it'll be fine. I got away with changing my guy to be flashing colors, so as long as it doesn't somehow give you an edge over people it should be fine. If you just change the colors a bit, there should be no problem. Just don't deliberately change it to get an edge.