Could've been it's own game.
I truly liked this game, it had some pretty decent platforming and overall was fun to play, all the rooms worked well and death wasn't a pain, so pretty good gameplay and design-wise.
But sadly, the fact that it copies the art style of the original game, and really does little to make something out of what the original was giving you to copy is where this downfalls. Now i'm not saying copying is great, but you just could've done it a bit better.
Like i said, the platforming was well done, and you've shown before that your art is good, and since the level design was fairly different from the original, you probably could've taken out the things that made this dungeon, and truly made something your own,