Hydorah is a nonlinear classic shmup with a large library of levels and enemies. The difficulty is based on the 80s standards, so it requires mastering in order to progress. Graphics are simple enough to not interfere with the gameplay, while they're polished to show the unique personality of each level.
It has a huge soundtrack composed exclusively by Gryzor87, who has not hesitated in taking legendary synthesizers to create retro futuristic, powerful and sometimes dark themes. Levels and music has been composed to fit each other like a glove.