LoKo Puzzle by Kobayaashi Studios $.99

 LoKo Puzzle comes from Kobayaashi Studios.  The object is to create a single path that uses each node once.  The Plus node must have horizontal/vertical lines.  The X uses only diagonals.

The blank nodes must use 1 diagonal and either 1 horizontal or 1 vertical.

Once I got the hang of this, I cruised through about a dozen levels.  I timed myself on level 76 (there are 78 levels and you can jump around).  2 minutes was my time.

Big Negative: when I opened the program later, all of my progress through those dozen levels were wiped out.

Still, I like this game.  Reminds me of Monorail from 2011.

https://itunes.apple.com/us/app/loko-puzzle/id1324532172?mt=8