Could've been better
The first thing I noticed was the major lack of sound.
Secondly, there are some bugs.
1) Was standing (practically) on a rabbit and firing arrows at it. THey went straight through without hitting it.
2) With the "power up" power-up, if an arrow is shot towards the eagles at full power, they will pass straight through it.
Fix these 2 bugs and add some sound and I'm sure you'll get a much higher score.
Add some more levels (or maybe a scenery option) and you'll do even better.