So I bought it Here are my thoughts as I use it (I will add to this comment. Hopefully the kids won't wake up soon.) Wish there was an UNDO. I just moved a n

So I bought it Here are my thoughts as I use it (I will add to this comment. Hopefully the kids won't wake up soon.) Wish there was an UNDO. I just moved a number and didn't want too. Shake to UNDO? Pinch to zoom in and out. I'm using this on an iPhone. Can I save a canvas? It doesn't look like, but maybe I'm missing it.