Awesome, but... Megaman!
This game is fun and nearly perfect. I am having a blast playing it. The only issue I've had with it so far is that Mega Man's control feels a bit off, mainly in his initial acceleration and jumping. Mega Man must be my favourite NES franchise so naturally I'm nitpicking ;)
Otherwise this is a fantastic concept and a ton of fun! In my opinion you should capitalize on the popularity this has had by making your own ad revenue from it, rather than allowing all these leeching idiots to make a profit (indirectly) from your work.
Looking forward to more works from you! If you plan to make any original 8-bit games I'd be more than happy to do the 8-bit soundtracks for them. You have the style, control and physics down pat for making your own NES-style game. Check out my profile to listen to 8-bit tunes I've composed, we could definitely work together.
Keep up the great work,
Nick