Game is gorgeous, wow! Love all the parallaxing effects and tilt-shift. Animations were smooth, title screen looked great.
Really enjoyed my time defending my flock, controls were intuitive and I felt like I picked up on the gameplay quickly. Brilliant idea to let you keep your spear if you get a direct hit on an enemy, it feels very rewarding for playing skillfully.
Day/night cycle seemed a bit slow to me, Day/night 1 was brutal on my flock and I didn't make it much farther; perhaps a more granular scoring system would be better than such large steps between 0-1-2, etc for newer players.
Overall, excellently done!!