thanks for playing, and the feedback :)
unfortunately i kept the controls, etc, only on the project page itself (ie, click Operations there) but should have included some basic instructions inside the game, too.
regarding the weapons themselves, there are different approaches to using them, i've found. some take advantage of any lull in the action to fire off while others hold on to the weapons to wind up the last few seconds with trying to eliminate any remaining crates (where clearing them all = Award points).
i know i'll re-visit this project to shore up the fun factor so thanks again for the feedback :)