Awful.
First things first. You deliberately gave the game bugs just to make it more "NES-y"? I'm not sure if you're aware, but nearly all of the most renowned games on the NES didn't have noticeable bugs. Deliberately adding bugs to your game using such a terrible excuse just seems like a lazy cop-out so that you don't have to fix them.
There isn't much to say about the game. It's just another iteration in the endless ocean of piss-poor Megaman ripoffs. There is nothing original about the concept or gameplay, which wouldn't be so bad if it was at least executed competently, but it wasn't. The unoriginality in the gameplay is only compounded by the fact that you literally stole all your sound effects from NES games and the music is an 8-bit rendition of Clint Eastwood by The Gorillaz. Do something original for a change.