From Box Cover PDF
CHOOSE YOUR PATH AND FIGHT PLANET BY PLANET AGAINST HORDES OF EVIL MEROPTIANS
Hydorah features lots of short and intense levels, unlockable weapons, secrets and a large library of enemies and bosses.
The dificulty is adjusted with situations that require strategies, equipment and route decisions and small random variations in each gameplay.
This game is highly inspired by classics like Gradius, R-Type, Turrican, Space Manbow, Hellfire, Guardian, Hydefos and many others.