Really love this little game! An innovative and fresh idea with neat details. How the owl follows the movement of the cursor with his eyes, how it looses feathers when you flap his wings and (thanks cyberdevil pointing out) how the mouse takes the dead owl away. I also love the how the owl dies..so funny!:D
Some ideas for a full game:
different preys: frog (leaps away, on water and land), snakes (in high grass), fish (near the surface of water), snail, moths (in air), earthworm
different levels forest, near the lake, swamp, grassland, by the barnyard, outskirts of a town
everywhere were mice are, were the prey would be
because owls hunt by night, the sight could be very important. More sight, the better you can see the prey. Owls recognize their prey by sound. Maybe you can visualize the sounds the prey makes.
upgrades through evolution points: better sight, longer flight, faster flap, longer stamina
other birds could be predators as enemies which hunt your prey or in later levels you.
so long