As others have posted in the past, the collision detection for C2 is pretty unreliable. Small objects, fast moving objects, changing window size during game, all cause objects to miss their collision. Other engines such as Box2D and Unity have systems that take into account, so it's disappointing to see C2 relying on the old 'teleport the sprite each frame and hope it hits' method, especially when it's being used on platforms as unreliable as mobile.
Are there any plans on upgrading collisions to C2, or is the collision system seen as finished? I have a few features in my game that would benefit wildly from this.