i can remember the name of this game

Hi,i need help to find a game name of the 90's-2000, which consisted of mmoving on in different worlds and killing enemies, it was 2D, the character wore sunglasses, and if you fall to the acid your skeleton floated. I think his name had a "Z" but im not sure, by the way its a PC old game, thanks in advance.

@hoyos98: Zax: The Alien Hunter

Is that it??

https://m.youtube.com/watch?list=PL0veHw6zInvpjqAUX-9b8o68DcAbwvBm8&params=OAFIAVgD&v=GkLl96Kfpzw&mode=NORMAL

Cool game hehe :D