Its nice i suppose, very impressive that you captured that smb1 feel but there are problems and liberties you should have taken for this mod to be actually like, fun, like giving the Mario the ability to break some walls including floor walls (or ice or whatever else that breaks) as that not only opens more paths than Mario, but also would make one level in particular beatable! (frozen hillside). the jump hitbox could also be made larger as it makes the bosses easier and not require precise jumps to even get one hit off. for my last piece of criticism which is less a criticism and more so a suggestion, is to gain the ability to turn on how getting hit with a fire flower doesn't send you to small Mario, and that's about it honestly, good mod, could be better, hope to see more from you in the future, very talented.
He’s Luigi