Video of the gameplay

Version Update
Version 1.2

Improved Gameplay

Version 1.1

New Label
Improved Gameplay
Change of Controls
Improved Graphics
New End of Game
Improved code

Thanks to Freds72 and Heracleum for all the great suggestions.
Background of Operation Pico
Operation Pico is based on an old favourite of mine, Operation Wolf first released in 1987. I enjoyed playing it at my local arcades and on my ZX Spectrum 128k with the best of gameplay on my great Commodore Amiga 500.
In Operation Pico there are six stages and 3 levels of gameplay to sink your teeth into.
Controls
Use the cursor keys to navigate the menu. ( X or left mouse button to select start )
Select (Normal Hard Insane) for the game play intensity.
Select mouse or keyboard ( cursor keys ) to move the crosshair.
Left mouse button = Shoot
Right Mouse button = Grenade
OR
Z = Shoot
X = Grenade
Rules
The object of the game is to rescue as many hostages as you can without getting killed. Use all your ammunition you have to kill the soldiers, tanks, helicopters, birds and chickens but try to avoid the hostages. Sometimes you might get extra ammo, free bullets, grenades or TNT if you shoot a bird or chicken.
Behind the scenes
I had a lot of fun coding Operation Pico. I think it captures the Operation Wolf gameplay in somewhat of a small form factor. I made a timer function that helped a lot with the animation of the entities. I will release a full version of the timer function soon. I ran out of Tokens so the game is not as I wanted, particularly at the end of the game. I have not coded for a long time so please forgive the messy code and lack of comments.
A side note : There still may be many bugs, please let me know when you find one. Also a big thank you to Youtube's Lazy Devs for the great videos on Pico-8.
Many thanks.
Have fun playing.
Antony