Hi, thanks for taking time to comment.
The crate not only drops ammo cartridges, also powerups. When you kill and enemy you may also get a ammo clip, you'll need to save bullets. When you're out of bullets you attack then enemies with a knife, just duck and get behind him and attack, just coordinate precisely your attack.
To throw the grenade you must press Down + Fire simultaneously. We desgined this way to use an spectrum joystick. We're thinking if its not best that the character throws the greande only when he's ducked on the ground.
To get rid of the dog press left and right until you get free of it. The dog only attacks you when you're ducked.
We have updated the game manual on this section Manual