This game is so ridiculous... I think I like it. It's about an "underwater secret agent" fish who shoots bubbles and kicks enemies off the screen for big points a la Bubble Bobble.
I love the arcade style, but there are a lot of issues. For one thing, I had to consult the manual to figure out how to do the missions - not very intuitive! Mushroom portals teleport you around, and it's very disorienting. Still, this is a zany type of game you really don't see much any more.
If nothing else, this is a very summer-appropriate game.