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Nice work for a first game release! Keep the updates going!
The game looks neat, but it’s optimization is horrible, you should work on that , my android device can run games like “Dead Trigger” with fairly good quality and no lag whatsoever , but on your game, the game lagged a whole lot, I’d suggest taking off the shadows and instead usinga backed lightmap.
From the video it looks pretty cool, the gameplay is basic but interesting. Of course it could evolve further with more dynamic terrain and obstacles.
If you can keep performance good I suggest you get one of the awesome shaders on the asset store: https://www.assetstore.unity3d.com/#/category/146
Imagine if you have a lava ball moving on tile leaving a trail of fire behind it, which damages enemy balls, or a shiny marble that makes that marble sound when clashing with another ball.
Keep up the great work, Sergey!