@DoraDoraBoBora , there are 3 different weapons and 4 levels to upgrade different ways before the 5th (with the copters), I was merely trying to give him advice on the way I am able to beat the 5th level, however, there are multiple "paths" to beat the game.. :-)
@darkruler, you need to have your gun to at least level 3 and you can destroy the copter.. shooting the bombs will get you points but won't damage the copter.. level 5 involves saving the soldiers while never taking the gun off of the copter.. I think if you keep at it, you will get the hang of it a bit better.. :-) We didn't want to make the game too easy! ;-)
@Archaides, I sent you a whisper about upgrading your weapon.. :-) @Atomsk, What are your PC stats, we tested the game on various PC's and didn't have a problem.. Maybe restarting or closing other apps/windows would help.. Cheers.