By tapping the attack button, you get a quick, light attack, which is good for fighting enemies up close. Holding it down gives you an extended attack. Thats pretty much all Bravoman does. On land, that is. Underwater, he transforms into a makeshift submarine type creature and has the ability to shoot depth charges and torpedoes.
Rapid fire works great here.
However, you are not alone in your mission. There are two allies that help you out. First there is Alpha Man. For a moment I thought they were power-ups. Thankfully, your second companion, Lottery Man, is much more useful, although he looks like some sort of freak permanently attached to a unicyle.