Planetfall TD is a tactical tower defense game available on Android that immerses players in a sci-fi universe where humanity fights for survival. The game features a unique twist on traditional tower defense mechanics, as players must strategically deploy towers that drop from orbit after a delay. This requires careful planning and real-time adaptation to fend off relentless alien forces. Players can choose from various defensive units and manage their energy to deploy and upgrade towers during intense battles.

The gameplay is enriched with a story-driven campaign set across hostile planets, where players encounter multiple enemy types each with distinct behaviors. A key feature is the signal range mechanic, allowing players to expand their deployment zone. Tower upgrades can be performed mid-battle, enhancing their effectiveness. Additionally, players can customize their unit loadout through deck building, making every decision crucial for survival in this challenging tactical environment.