Sea Bomber

In the summer of 205x, alien creatures from outer space invade the ocean floor of the Pacific Ocean. On Earth, they were called "negative jellyfish" and were frightened by their negativity.

Sea Bomber is an action game where you play as a frog diver who sets out to exterminate black jellyfish. The weapons include a sea bomber and a diver gun. Sea bomber explodes when it touches something. The diver gun is not effective against "negative jellyfish" (nekurage) but it can exterminate sharks (joke). The amount of oxygen is 1000, and when it reaches 0000, you die. You can receive supplies from the boats passing above, so touch the boats.