Noded is a neat-looking puzzler that's all about folding geometric shapes. There are nodes involved too, as you can probably tell. The game is out right now for iPhone and iPad, where it'll set you back 99p / 99c.
There are a whole bunch of puzzles for you to smoosh your face into, and they get tougher the deeper you get into the experience.
On top of that you won't need an internet connection to play, and there's a colour blind mode if that's something you need.
This is a calming and thoughtful puzzler, and you can pick it up right now by clicking on this link that I have created.