GTA: Bloody Night
It all started one night when an evil being opened a portal to the underworld. Countless monsters emerge from the portal. Everyone thought that this is the end, but then a hero appeared and began shooting at the monsters. Try to defend the tower as much as possible. the tower can also shoot, but it won't last long against horde of monsters. Some monster drops coins and bandage. You can use the bandage to heal yourself while you can buy some upgrades after each level with the coins that you collected. Both tower and hero can be upgraded if you have the money.