This is cute, simple, and fun! The music is fitting as well. Some SFX would have been nice, though, for when you pick up cookies and drop them. I came across 2 bugs, by the way:
1) even though time has run out, you can continue playing. The delivery counter continues to increase and the failed deliveries can still decrease.
2) the helicopter doesn't need to be in the air to deliver the cookies. It can fly low and just pass through the tubes.
But those are just the major things. Otherwise, just some tweaks here and there. Great job!