Fortress TD Era Monsters is a free strategy game developed by otgs17 for Android devices. The game allows players to lead an army of zombie mutants and break the defense of people. The objective is to evolve and capture every city to become the most powerful monster army.

The game is set in a new era, the era of monsters, where players must use their strategic skills to overcome the human defense and take over the cities. The graphics are visually appealing and the sound effects are immersive, creating an engaging gaming experience.

Overall, Fortress TD Era Monsters is a fun and challenging strategy game that will keep players entertained for hours. However, it is worth noting that the game may not be suitable for younger audiences due to its violent and gory nature.