Honestly, I love c2, but I think architecture could be greatly improved upon. I want to see better scalability, plugins from event sheets, a real option for those who like scripting, modding of core files, and the like.
I know c2 is made by a small team, and so my comparison to unity is never fair. But it is worth pointing out all the things that make one environment great and another okay.
I sure would like to see export that isn't html5 and jscript...
Mostly I want all this because I like c2, but I can only use it to make small games/prototypes. There is too many issues with jank (I know these aren't all c2's fault) but jscript kinda sucks for games.
I'm in nomatter what, but here's hoping for c3 (and not 3d c2, but a better construct for 2d game dev)