Defend the Dragon Palace is a strategy indie simulation game on PC in which players shape an underwater ecosystem to protect the Dragon Palace from invading divers. The core loop centers on digging into the seabed, allowing sea beasts to emerge and form a self-sustaining food chain that serves as the primary defense. No direct commands are issued to the creatures. Instead, the layout created through excavation determines how the ecosystem develops and responds to threats.
Gameplay
The central mechanic involves digging different types of soil, each influencing which species appear and thrive. Nutrient-rich earth supports kelp and urchins, while mana-soaked earth favors sea bunnies and mermaids. Eight species participate in a single food chain: kelp, urchin, octopus, sea firefly, sea bunny, mermaid, umibozu, and skeleton. These creatures move, eat, and breed according to their own schedules without player intervention.
Strategy emerges from how the excavated space channels or disperses incoming divers. Narrow corridors can funnel enemies into kill zones, while open halls allow swarms of beasts to surround and overwhelm them. Divers include fishermen, harpooners, monks, armored warriors, a turtle girl, and additional types, each with distinct tactics and exploitable weaknesses. Fallen divers leave graves that can be dug up, turning their bones into skeletons that fight on behalf of the palace.
Otohime, the ruler of the Dragon Palace, provides eight princess skills that players purchase with earned coins from a title-screen shop. Each skill has three upgrade levels and only one can be equipped at a time. Available effects include healing beasts, triggering a quake to level the dungeon, or carving multiple tiles in a single action. The game offers full controller support with rebindable controls for mouse, keyboard, and gamepad, plus bilingual Japanese and English text.
Game Modes
The main campaign consists of eight stages designed for roughly two to four hours of play. A high difficulty mode unlocks after the initial clear, increasing the challenge for experienced players. Two tutorials cover basic and advanced mechanics to help newcomers understand the ecosystem and digging strategies.
Banquet Hall functions as a free-form sandbox where players can dig and cultivate an ecosystem without the pressure of defending against divers. Supporting features include a sea beast encyclopedia, a diver encyclopedia, and an ecosystem chart that track progress and interactions across play sessions.
Is It Worth Playing?
Players who enjoy deliberate strategy and simulation elements will find the autonomous ecosystem management rewarding. The short campaign length suits those seeking a focused experience rather than extended sessions, while the sandbox mode and unlockable high difficulty provide replay value. Controller support and accessible menus make it suitable for relaxed play on various input devices. Those interested in indirect control systems and emergent behaviors from simple rules will appreciate how digging choices shape defensive outcomes without micromanagement.