Neat! I like the concept of an unkillable (I think) enemy tracking the player. It felt kind of hopeless the first few times I played. Though some items definitely helped later, it seemed that no matter how I managed scent I would just stumble on the Fiend regardless. I would jump down a canvas and sometimes see them immediately there. It was unclear if I could lose them and how easy that is. I would like it a little more if the game focused exclusively on scent and the Fiend was blind, so I could use tactics that clearly threw the Fiend off my trail.
Also, may I suggest QWEASDZXC keys next time?