Dynamite Headdy? He wasn't silver but he didn't have joints.
As for mine:
Genesis/SNES era game, but could be on Amiga or PC or anything like that.
Play as some guy, no idea what he was. Looked like a normal human though.
Fought horrible monsters. Graphics kind of reminded me of Flashback/Another World/The Immortal, etc.
Took pieces from the monsters, ie heart from one, brain from another, to make one big monster.
I know you killed one monster by dropping a big stone slab with spikes into it.
That's all I remember!