Some Ideas! :)
I think that a few, if not all, of the following would really help to improve the app in my opinion. :)
• A 'blur' tool.
• Being able to scrub the audio. (If that isn't already planned out, since the audio idea is already being worked on from what I've seen. ^^)
• More layers! It feels like 3 just isn't enough! :,0
• Being able to REALLY tween.
• Being able to move the camera around during the animation without having to select a space and then zoom in. (A great example of this would be the Stick Nodes app.)
Just some friendly suggestions! Thanks!