I would caution against aiming for releasing large games for mobile with Construct 2, at least at this point in time with the current exporters available. What you may find is after creating a huge project it doesn't work very well (slow game load times, bad FPS, etc).
I would aim for smaller games and smaller APKs, if you really want to do a larger game for mobile you may want to consider using another game engine that handles memory better with mobile devices. I think there are things in the pipeline for Android and iOS but I don't really think we're there yet.
Plus I think it's just better practice in general to aim for small apk sizes. Lots of people will cancel download if it's greater than 50mb (I'm pretty sure Flappy Bird is less than 1 mb!).
(this is just my opinion, anyone please feel free to dispute this)