so far I enjoy C3 in the browser. I often use construct's GFX editor to create assets, but there's one problem with the opacity/alpha of the brush and pencil, while directly painting by holding mouse button pressed - it creates multiple layers of color instantly, so there's no opacity visible. So it's not possible to paint over with half transparent color for example. I think this bug should be easily fixable.
Another thing, one of the most common tasks in game dev is to animate a value from A to B to C etc (position, scale, opacity, angle). Tweening is still not supported officially, which is strange. In C2 there were 3rd party plugins, in C3 there's nothing.
Guys, please implement a good and versatile Tweening plugin/behaviour officially.