I love the mysterious soundtrack and dark blueprint look. The simple and fun gameplay is nostalgic for me, and exciting for my 8 and 10 year old kids over wifi.
Nits: the board is too small for my average adult male fingers on an iPhone 5s. I miss 1 or 2 cells every game, frustrating. Theres plenty of screen real state to make it larger. The lower left back button is too easy to press accidentally when aiming at the corner cell, and its yes/no confirmation buttons, like many, are too tiny and close together.
3 separate apps (sea, air, space) instead of building them into one great game. Each consumes 150MB on device and three icons. The price to remove adds quickly gets expensive at $3 per device per game. It would be $27 for our 3 iPhones across the 3 games.
Playing cross-game is intriguing, but it is not supported for playing the computer, and most online opponents seem to play only the sea game.