I enjoy this app & like the graphics, but the layouts very quickly (like by level 4) become unsuitable for a 4" iPhone screen. The layout is spread out, rather than deep, so it has to make everything very, very small to fit on the screen. Far too small to be able to differentiate between similar tiles. If I zoom in so I can make out a tile, I can't see the whole layout anymore. It's just an annoying waste of time, all the zooming in & out & panning around.
I'd much rather have a layout that's 15 layers deep & all fits on my screen at a visible size than these shallow, sprawling layouts.