A decent port, but kind of glitchy.
It certainly feels like the arcade classic, but both the sound and music are kind of off at times. The music can glitch when it changes, particularly when you pick up a hammer.
You tried really hard to make the game emulate the style of the original Nintendo masterpiece, but unfortunately, both the jumping and speed are kind of off. Jumps that would work for me in the original game send me too far in this one.
Also, I saw a fire drift down a ladder, keep going through the floor, and leave the screen on 50m.
Overall, nice work, but a tad buggy. I think you could have made up for it though, if you had actually made your own levels in the style of the game. Now THAT would have been cool!