a bit to late but i hope this will fix your schadowgun problem
Shadowgun : github(dot)com/ouya-saviors/ouya-game-data/issues/81
Fix : Install the following files on your Ouya
Apk : ShadowGun-v1_6_3-OUYA-signed
Obb : main.90011163.com.madfingergames.shadowgun
Put the obb file this folder : “Android/obb/com.madfingergames.shadowgun/”
credit: @Ryo_Saeba
topic: Unplayable Games + Fixes
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have fun playin that!