picture this:
your player comes into a large circle room with an endless cieling. This is how the boss battle goes:::
I am an ordinary guy, standing against a wall all cool-like. Player runs towards me and i suddenyl flip out of my position, flying through the air devil-may-cry style shooting a gun and using my other hand to make lazers and coils and spikes rise everywhere and fly into every space. When i land, a huge shockwave goes out and i transform into a human, with giant scythes for arms and crazy feet that allow me to travel extremely fast. I spend 5 minutes simply running around my oponent, slashing at them with thier rediculously long health bars. Eventually my 1 hp will be gone due to a hit, and i will die. Or will i? Just before i fall, my skin falls away and i turn into a being not unlike the dahaka from pronce of persia warrior within. I throw my armys out and massive arrays of lazers and tentacles fly everywhere, causing a colour desplay of death like no other. Then i turn final fantasy style and grow a sword gun out of my arm, and fire lazers to distract, when the smoke clears i have already charged the pulse cannon, its too late. Unless the player reacts instantaneously, my pulse hits him and he simply blasts into atoms in a very dazzling and painful display of power. I stand there and say "till next time". Game over screen displays.
Sounds good, no?