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Hey! I did figure *something* out, so for me it affects just the Player - 

In the Player Create Event,  I put:
//shader
pos_uni = shader_get_uniform(sh_hue, "Position"); // control shader

// -1 - min, 1 - max
pos = 0; 

and then (still in the Player object) I have an enemy Collision Event, so when Player takes damage I have:

// Take damage
    pos = 2; //references Hue Shader

^ this alters the colour of the Player, but the whole colour (ie. white bits also change hue). I haven't had a play around to see if I can get it to only change certain parts of the sprite, but maybe this'll help!