In SML Mario is getting the "Superball" feature when collecting the Flower.
I have checked the english SML manual regarding the Superball Flower. There the flower
is actually red and not just green like in the hack right now. Maybe this could be changed.
Since SML was a monocrome game, there was never a different color for Superball Mario.
Also in the manual Mario is just B/W. Changing colors of Mario for this mode would be cool.
I would just turn the colors of the cloth. What is now red becomes blue and what is blue gets red.
Maybe the Superball itself can also get a friendlier color than just black.
What I was not aware of so far is that according to the manual,
Mario is loosing the Super Ball feature after a fixed amaount of time.
Is that true? I know the game since it was released on the GB but
I never saw that the ball is going away after some time. Interesting

The pyramid music theme of Lv. 1-3 seems to be used also in other levels.
That is a little boring and not fitting. Maybe a new BG music can be made and added?
Having Luigi like in the SML2 Hack would be cool but I guess that is a bigger modification.
In the Title Screen somehow I feel the words "Super Mario Land" should be in red insted of blue.
It is also red on the manual. The blue is to unusual for this title.