Nimbers

This is a different kind of project from what I usually do. This is a smartphone game that I've been working on with a developer friend. I've always liked mental calculation and I've really enjoyed creating this game.
It's called Nimbers, it's a puzzle game with numbers for android. It's still in progress and I know there are still some things to do, but I would really appreciate if you give it a play. :)
You may download it on Google Play: https://play.google.com/store/apps/details?id=com.mathgame.nimbers
Enjoy it!