An FPS game similar to Borderlands. Optional IAPs.
http://www.appshopper.com/games/bounty-hunter-black-dawn
Looks like it's on the Android store as well but I'm not sure whether they can revert back to paid: https://play.google.com/store/apps/details?id=com.ifreyrgame…
Started playing for 30mins and it seems like a decent game to download for free!