Great game I like the concept and visually looks great. As it has a slightly dark tone with murder I had to try not feeding any to see what happens.... I feel this was a missed opportunity. I would have been nice if right mouse button dropped the food held as picking up and getting rid of wrong food could have felt more responsive. Just giving some ideas, I enjoyed it a lot.
If you did revisit and try to extend, I would suggest 3-5 slight variations of Crow animation (a hop, overshot landing,, variation bobbles) as this is the main focus.