Neat concept! I like the idea of a creature that exists in the shadows grabbing unsuspecting victims. I did find it difficult to select a place to move on several occasions. Some of the areas are really obvious, but some are hard to distinguish between an overlap of lights or a moveable space. It also took me far too long to realize that this wasn't tile-based. I kept clicking the same start area wondering why I wasn't moving!
Final note, when you complete the game, the mouse cursor is not shown on the replay menu, so there is no way to click the elements.