In the Moorhuhn series, Jump’n Run games are obviously not shooting games, but
platform ones.

With this one, Moorhuhn decides to discover the underwater kingdom of
Atlantis. In each level, over and/or under the water, he will have to collect
items, jump over enemies, mummies or carnivorous plants, for example, to kill
them, climb at ropes, find powerups such as hearts, red crosses and ammos.
Green crystal are save points and red crystals mark the end of a level. Under
water, you will find more dangers, such as octopuses and jellyfishes, and you
will have to deal with a limited quantity of oxygen.