This is a really good take on this game! Well done!
I also like the fact that you start out with a wall to defend yourself against the first few birds, and you deflect birds off of your crushers, so that you won't be punished as hard for eliminating birds that would have gone through without your intervention.
I also like the diversity and the customization that is available to the player for this game. It really adds depth, variety, and progression to the game, which is great.
For the amount of fun and the promising nature this game has to offer, I give this game 5 well-earned stars.