Thank you, guys. By the way, I changed Fire Mario a few weeks ago
I'll probably release two patches as I mentioned before, one with the original graphics (a heart instead of the 1-UP Mushroom, "feather Mario" instead of the proper Fire Mario, no Luigi, etc.) and another one with the modified ones.
On a different note, this is how the overworld looks at the moment:
I'm constantly tweaking it, but there are so many limitations that it's really difficult to make it look better. What do you think?