'kay.
Au passage, le gameplay de ce touhou est légèrement différent. Les explications du wiki :
"Marine Benefit features three playable characters to choose from. Each of which has three shot types to choose from.
The game features 'Oxygen' and 'Hydrogen' items which, when enough are collected, grant extra lives and bombs respectively. Hydrogen items are also important in that the marker which indicates how many you have also acts as the game's point of collection.
Grazing is also important as it increases both Oxygen and Hydrogen."