excellent
I love how there are so many different types of attack, weapons and specials to unlock.. It shows all the effort involved in creating this and kinda giving variety to a standard side scroller. Personally, I thought the pace was rather slow and it took too long just to run across the screen, let alone making the bird fly everywhere to get the key. I enjoyed things such as using the bird as an extra lift, however... that in itself was pretty tedious.
So long story short, I loved the great visuals and effort put into this, but it drags on and gets boring fast.. at least for me anyway.