Protector

Protector is the first game in the Protector series by Undefined, released on February 4, 2008. This is a tower defense game that features 23 levels. It also has a direct sequel called Protector: Reclaiming the Throne.

This game gives you an arsenal of mages and dexers to help defend your base, each one possessing different powers. There are a total of 5 different basic units and 4 advanced units, which can be unlocked with skills. Each unit gains experience for damage caused and can be upgraded as they reach set amounts of experience. Depending on the type, units can be ranged or melee attackers; melee units can't attack flying enemies.