You have to be more original.
You're animating needs work.
This wont make you a huge success, however...
You can animate better than most so you have a ton of potential already.
Focus and always make your next project better than the last.

Clean casual gaming.
It's like a game that comes with your phone.
Simple and entertaining.

Is it incomplete or just extremely difficult?

It's decent, and an honest to god game. Everything's there. I love how that cloud just kinda introduces itself all "I'm smiling so if you hit me with that rock something great will happen" and since I've only been hitting the birds all i know is "Oh if you hit stuff good things happen" so you hit the cloud and you loose all your points. Well played.
The birds shitting all over you, a fox throwing rocks at them, killing them for their fruit, a fox choosing fruit over eating the animal it just killed, the dramatic music, that fucked up cloud. everything was pretty in place.
All you have to work on is your graphics and you should be just fine.

I think replacing the drum and hihat and other traditional instruments with glitch type noise would have an even darker effect

I agree with that other guy i think the drums and hihat sort of take away from the mysteriousness of your ambiance, i would love to hear it without. Its great otherwise