Revenge of the Titans by Puppy Games
Revenge of the Titans is an indie strategy game developed like Puppy Games that tasks the player to defend Earth for an alien invasion. The top-down indie game requires players to mine resources and build turrets, walls and mines as defense from the approaching army of aliens.
With the additional funds you make from defeating waves of aliens, players will be able to invest in technology to improve their defensive structures. However, as your lasers become more powerful and your walls higher, the enemy aliens evolve as well. They begin to send armored alien as well as boss aliens that require a lot of concentrated fire and on-the-fly defense deploy to repel. Puppy Games did a great job in creating a unique strategy indie game experience in Revenge of the Titans.