The app works well, and althought there is helpful guidance at start-up and any time via the "i" button, the workflow is intuitive if you have experience with layer and blend modes, ala Photoshop. If not, some of the modes can be a bit overwhelming.
I really like the layer approach, and each layer can be selected and the image independently scaled, moved/repositioned,freely rotated, etc. Layers can be moved up or down in the stack (this is important and can be daunting when using blend modes), deleted, or replaced by a new image. That being said, a few improvements would be welcomed additions...
1. A "clear all", "new" or "start over" button, to, well, start a new project.
2. Ability to unlock the aspect ratio of a layer so it can be resized without maintaining the original aspect ratio.
3. An expand or fit to frame/opening button would be helpful.
4. Improve the resolution a bit. The maximum size of a saved project seems to be 2048x2048. If you change to 4:3 the resolution changes to 2048x1536. Since the app has a fixed base layer (default black or other color), it would be helpful if the resolution could be set higher via that layer, then all image layers would be scaled up/down accordingly.