Android app not compatible with tablets

I just developed a new app (https://play.google.com/store/apps/details?id=com.viewpointus.workstatement), when I uploaded it to Play store it doesn't seam to be compatible with tablets, but it does install in the AVD (Android Virtual Device), also on my Nexus 9 tablet I installed it. specifications:

minSdkVersion 16
targetSdkVersion 21
compile 'com.android.support:appcompat-v7:21.0.0'
compile 'com.android.support:support-v4:21.0.0'
<uses-feature android:name="android.hardware.telephony" android:required="false" />
<uses-feature android:name="android.hardware.touchscreen"  android:required="false" />