The design is kind of poor. Yes, it's a world 1, but this doesn't justify the fact that there are very flat zones with ground enemies as your only obstacle. From experience I can tell that a world 1 can be very fun, even if not challengy at all. It's not the case here, every level I played has nothing but flat land and ground enemies.
Aesthetic-wise, it's good. I like how the hack keeps a vanilla-ish feel, yet uses some exgfx as background and foreground. I wish there were more decorations. The levels were flat already, using no decorations made them empty as well.