I agree, unfortunately. I would like to do MSX and Mega Drive games.
If you really want to build for NES you might have a look at this guys:
https://www.kickstarter.com/projects/13 ... g-required
The project is interesting but nothing compared to C2 for what I have seen in some of their videos.
EDIT:
An alternative would be to use C2 to create your game and then run them on a micro computer as a Raspberri-Pi for example and then put the Raspberry inside a broken NES case. With a little bit of work it would looks a NES from outside but inside it will be something different.
By the way, I posted still in this section some tutorial for create a Side Scrolling Shooter that might help you to build a game that resamble the NES ones <img src="{SMILIES_PATH}/icon_e_wink.gif" alt=";)" title="Wink" />
Thanks that's sounds like a good idea!