Thanks again for reading my book Moving on makes sense for multiplatform, and the knowledge really does carry on pretty easily into C2.
There are some things that CC can still do better right now, but sharing the game on anything other than Windows is definitely not one of those Also, C2 editor has some very appreciated improvements and is less buggy overall.
With export, right now Node Webkit 10.5 is the best choice for executable, but web is really what C2 is meant for while the third party wrappers (and Google Chrome) catch up to the promise of HTML5 + WebGL. If you use only Canvas2D (no WebGL FX) then WiiU might be a possible export platform too! (hopefully someday WiiU will support WebGL).
In the case of Insanity's Blade, I notice that the game demands a really high-spec (and recent) machine to run properly, where GPU limitations will decrease framerate, and CPU limitations can wreak havoc on collision, event ordering, and also framerate too (try to always stay at or above 60fps, or things get strange). We're still debugging oddities here and there, but overall the game is received well which we're glad for
Hope that helps and good luck! I really love the graphics style you're going with so far