See I think you got it the wrong way around. I found myself always holding the slow down button as that made the game not kill me and helped me aim. If you were to make the the game always be in slow motion and the button press to speed up the game, then I think you would be onto something. You could creating some really interesting and challenging puzzles, as slow motion would be the default easier mechanic and speeding up is where you could fail. Now you have it the other way around,default mode is harder than slowing down mechanic.