Compared to the classics, it's abysmal.
You cannot compare this to Ninja Gaiden, Super Mario 2, Megaman 2, or Ghosts N' Goblins. The graphics are alright for an eight bit game, and for as long as the level was, there should have been more variety of tiles than the same ones that I die over. In the classics, there were different levels, and the scenery changes. This. It's boring and frustrating.
The worst part is the ads that pop up after you die. Do you see this on the games I've mentioned before? No! It adds to the horrible experience and it wastes my time. I wouldn't mind you getting money if this was a good game. Some music would be nice too, and different sounds than the three beats you've got in there.
In the end, it's less a game and more of a tedious chore. Challenge would have been cool if not for the wacky controls. Besides, it shouldn't have the medals like it has, because it's for your benefit only. (Which is to get more money from those who want medals.)