Well. If targets are far, they are no easy to hit; consider that enemies are also moving.
My technique is to slightly shake the mouse, in order to create o "cone" of bullets.
Sometimes it works... sometimes not.
Or may be you should follow enemies: when they are moving in front of you they are mush simple to hit.
 "Mighty Party"){kind=icon}
 "Sequence"){kind=icon}
 "Spaceport Command"){kind=icon}
 "Tap Heroes"){kind=icon}
 "Epic Boss Fighter 2"){kind=icon}
 "Super Idle Master"){kind=icon}
 "Space Flash Arena"){kind=icon}
 "Valthirian Arc 2"){kind=icon}
 "Good Daddy 2"){kind=icon}
 "Mob Wars: La Cosa Nostra"){kind=icon}
 "Royal Offense"){kind=icon}
 "Pirates Of Teelonians"){kind=icon}
 "Enough Plumbers 2"){kind=icon}
 "Air Fight"){kind=icon}
 "LIBERATION OF NORTH KOREA TCG"){kind=icon}
 "Battle City"){kind=icon}
 "Awesome Pirates"){kind=icon}
 "I Am Level v1.0"){kind=icon}
 "Dungeon Rampage"){kind=icon}
 "Time Mirror"){kind=icon}
fixed!----------------------------------------------------------------EDIT: fixed!