This was a fun one!
I liked the main mechanic and how this game forced me to think. The levels were pretty good overall and were just the right difficulty.
The main issue I have is that there isn't enough feedback for shooting the hostages, the game over is too delayed.
Also I think some spy music would really improve the feel of the game.
I really liked the incredibly serious art style and the realistic pigeons (we all know the government is spying on us using pigeons).
I am impressed that this was made in such a short time especially since puzzle games can be really hard to get right.
Well done!