in Turrican 2 for the Amiga...in the first level there is a Boss that hops around and soots and pieces of rock fall from the ceiling. How the hell do you beat this boss. I know you can jump on his gun and shoot on his head but when he jumps he drags you on the ceiling and you aklmost die instantly.
You need to jump on and off his barrel several times. Or just jump and shoot into his face without landing on the weapon. What also helps is the super weapon you have once per life. Was it <space> + <fire>? During that you are invincible.
Maybe you have realized that yet - and maybe you haven't:
Turrican is one of these "oldstyle" arcade shooters with "dumb" bosses:
The bosses in that kinda games repeat a fixed movement scheme over and over again until you blew them up.
Thus it is possible, first to "cover" while just watching them for a while (to find out their moving sequence) and then to fight them - being now able to "predict" their next move.
So you will know when to jump on and off the gun - or whatever.
Oh, befor I forget it:
In some cases there's in any of that arcade shooters one or more places on screen where you can't be hit by the boss or any of the bullets/shoots he fires after you - call it a "blind triangle" or so...