Billy Makin Kid
Billy is the last man on earth, and the apes are on the way to destroy him. Oh noes! While Billy repopulates the earth, you need to fight off the hordes of monkey minions. Build fighting units, upgrade towers, and keep monkeys from unlocking boss monsters!
All of your management skills are needed here. Acquire new resources and combine them to make new fighting units. Now show those apes how we humans roll!