I honestly don't understand what problem you have with the node webkit exe export then. If you don't care about the speed difference, and C2 can do almost all of what's relevant that CC could do, with almost all of the rest of it on the way, the games look and run exactly like other exes because they are in fact, actual exes that can be distributed on steam, what problem remains?
* Node-webkit game weight
* Different resource loading methods
* Different scaling (or almost-fullscreen scaling) (html5, as i figured out can't stretch game to fullscreen with integer but without letterbox, you know)
* Lags
almost is a keyword here, you know
Offtop:
<font size="1">p.s. this engine is bugging me
<img src="http://i.imgur.com/IUJRz6S.png" border="0" /></font>