I really enjoyed this! I love the puns and silly messages to deliver. It was fun being a pigeon.
I had a tough time controlling the pigeon at first, esp via the keyboard. I'd love the ability to just use my mouse to change direction (kinda like a typical FPS or game like minecraft). Or I'd like the ability to use a controller (In fact, that's what I used to control. D-pad. but there wasn't a fly button on the controller so I used my right hand to press shift to fly).
The flying felt very realistic though I wished I could fly higher. I also kinda wish I could use a 'flare' effect to kill my speed closer to the target.
And I agree that some of the time limits were a bit too short. A few times I was only part-way to the target when the order canceled (and I didn't think I made any mistakes).
However these are fairly minor or shouldn't be too hard to implement and didn't distract me from finishing the game.
Great job and if you make any updates, please let us know!