I'm amazed by how you managed to pack so many actions to the limited buttons of the NES controller. It took me a while to understand everything, but I managed to craft a couple things before the difficulty curve could overwhelm me.
The NES feel is totally there. The graphics and music are awesome, like straight out taken from an actual NES game. The gameplay also had its moments. For example, a couple times the turrets were hitting zombies and launching them over my defense walls. It was hilarious because I can 100% see that happening in an NES game.
The only issue I ran into is that at some point I crafted so many things that some of them dissapeared.
I would have liked that it was longer, the game has a lot of potential.