GTA: Hold the Fort
Monster come out from nowhere and were feasting on the humans. Each town they visited, they destroy. One day, one brave man decided that he would stand up against the monsters and went on to the nearest fort. He repaired the fort and make lots of arrow that he could use to stand up against the monsters. He hope of attracting more survivors to his fort that could help him fight the monsters. The idea here is to defend the fort. You need to shoot the monster with the arrow before they can even get closer. After every level, you would have the chance to upgrade your character and make some necessary adjustments for the fort.