Ok, it looks like the tablet is 800 x 480 resolution but it's possible that the nav bar at the bottom may be taking up some of this space and causing the game to assume the device is small screen. Does the bar still display when the game is running or does it ever hide? (this isn't a device we've ever seen so we're not exactly sure how it functions).
One thing you could try is restarting the device as this seems to have helped some people with similar issues. You could also try uninstalling/reinstalling - let me know either of these help.