If you haven't figured it out yet, you need to uninstall the previous version on Android to play it. It can't overlap. Also, to keep your saves copy Save.rma and Saveinfos.rma (just in case) from Android/data/com.GrizzlyGamer.RMAWhellcum/files and add it to a desired location, uninstall the game, install new version, open and close, and place Save.rma and Saveinfos.rma back to the same destination.