Fortress TD is a free strategy game developed by otgs17 for the Android platform. In this game, you have to find shelter and turn it into a fortress to stand against the hordes of monsters that attack at night. You can either search for supplies and transportation or continue your journey during the day, but when night falls, you must be ready to fight.

To fight against the monsters, you can equip soldiers, use bonuses, and keep an eye on the energy level of your fighters. You can also use your transportation to your advantage, and it would be nice to find a tank. As you progress in the game, the number of monsters increases, and they mutate into stronger and more dangerous forms.

The game offers an additional full storyline on the first island, and you can find more information about it on the developer's Facebook page. Overall, Fortress TD is a challenging and entertaining strategy game that can keep you engaged for hours.