Patterns - Interactive Android Live Wallpaper made with Unity [Giveaway: Permanently free version]

Hello!

I have just released the live wallpaper app "Patterns" which features 23 handcrafted geometric live wallpaper themes that are customizable and interactive (reacting to touch input and gyroscope). The live wallpaper is inspired by op-art (optical art) and artists like M.C. Escher or Victor Vasarely.
You can find many pictures and a video of it in the Google play store listing:
https://play.google.com/store/apps/details?id=com.aaronjablonski.patterns

I am a sole developer and this is the first app I am publishing to google play, so I'd love to hear your feedback and suggestions! Also it would be nice to see how it runs on different physical android devices as I could only test this app on 4 devices so far.

If you would like to test the live wallpaper for free just pm me your googlemail-address (the one you use for your android device) and I'll add you to the beta tester group. Then you can download the free version with all features unlocked directly from Google play.
Unfortunately this is the way it works for google play - Google does not offer a promo code system or vouchers for apps, so I had to upload a "beta" version that is essentially a permamently free version with all features unlocked!

As a little bonus I also created a small album of desktop wallpapers (1920x1080) based on themes from the live wallpaper app!
http://imgur.com/a/4UtNE#0

If you encounter any problems with the app or have other suggestions/complaints, please let me know!