My first small game in collaboration with talented artist Samantha Ong, "Defense: Evolution", is out on Google Play and, despite being a "minimalist" type of game, working with a real artist definitely made a huge difference in the final result.
"Defense: Evolution" is a game inspired by Conway's "Game of Life" that turns the original set of mathematical rules into a simple game with elements of tower defense/rts games.
You can get it here: https://play.google.com/store/apps/details?id=com.adsumsoft.defenseevolution
The iOS version is on the way as well (it has been "waiting for review" on the AppStore for ages already...). Anyway, even if the game runs on both phones and tablets, the latter are recommended due to the larger screen, otherwise it may be a bit tricky to touch the individual grid elements and place your units in the game.
Cheers and let me know if you like it!