Very cool, fun concept, however:
Exports worthlessly low resolution, highly compressed images.
Does not let you change the canvas shape or resolution.
Crops photos used as a background.
Text size can vary with the speed of drawing which is really cool... But you cant set a min/max size-- so if you move your finger at what I find a reasonable speed to be accurate, the font is tiny. I have to swipe way to fast to get the size font I want.
The cropping and export resolution issues means that this app does a TERRIBLE job of creating watermarks for your photos - which is the reason I bought it in the first place. Disappointed, but hopeful.