GAMEPLAY: What's here works well, and does give an interesting dynamic, but it gets boring after a while. My mind first springs to including a full map: players know where to go, but with this little light, they have to figure out how to get there on their own. The glow of the rat's eyes is a nice touch, though if it were me, I would've picked some spooky-monster-thing and went typical horror. Rats are cute. I also had issues in the web version where upon replaying, the camera was offset and I couldn't move.
VISUALS: I'm getting conflicting messages here--most of the game is pixel art, but the UI and player character seem to be vectors. The pixel art itself is fine, but could use extra flair. Landmarks would also be useful for navigation, or at least variety.
AUDIO: The howling wind sets a good uneasy atmosphere. The flame sounds and rat squeals fit. Not much more stands out.
THEME: Jamming skulls into my flashlight is resourceful, but nonsensical. A literal torch would make more sense, and campfires could then be recharge points as well as rest stops.