App on Iphone won't delete?

I added an app on my iphone called Turtle Fly and 1. It never completely downloaded and 2. I can't delete it now. I tried manually deleting it from my computer, but it's still on there!I even tried deleting it from the app store. I can't download any other apps because now this one isn't loading... I don't know what to do. Is there any way to delete it??