Simplified counting

function enemys.hit_rightWall_event(self, event, movement)  -- should be called when 'Enemy' hits the right wall
    self.movement  = -self.movement
    self.numberOfWallHits = self.numberOfWallHits + 1
    checkNumHits(self)
end

function enemys.hit_leftWall_event(self, event, movement)  -- should be called when 'Enemy' hits the left wall
    self.movement = -self.movement
    self.numberOfWallHits = self.numberOfWallHits + 1
    checkNumHits(self)
end

function enemys.collision(self, event, movement)
    if event.phase == 'began' then
        if event.other.name == "leftWall" then
            scene:dispatchEvent{name="hit_leftWall_event"}
        elseif event.other.name == "rightWall" then
            local message = {name="hit_rightWall_event"}
            scene:dispatchEvent{name="hit_rightWall_event"}
        elseif event.other.name == "floorWall" then
            loadAd()
        elseif event.other.name == "bullet" then
            --if(enableSound) then
                enemyShotChan = audio.play(shot,{channel=7 })
            -- end

            event.target:removeSelf()
            removeArrayItem(self)
            timer.cancel(self.clock)

            scene:dispatchEvent{name="enemyDead"}
            Runtime:removeEventListener( "enterFrame", self )
            self.image:removeEventListener( "collision", self ) --DISPATCHING AND NULLING THE INVADER
            scene:removeEventListener('hit_rightWall_event', self)
            scene:removeEventListener('hit_leftWall_event', self)
            scene:removeEventListener('hit_floorWall_event',self)
        if self.image.y ~= drop then
            local explosion2 = display.newSprite(budSprites2.sheets.explosion, budSprites2.sequences.explosion)
            explosion2:scale(1.5, 1.5)
            explosion2:play()
            explosion2.x, explosion2.y = self.image.x, self.image.y

            timer.performWithDelay(260,
                function()
                    if explosion2.removeSelf then
                        explosion2:removeSelf()
                    end
                end
            )
        end

        local currentScore = getScores( )

        -- EFM SCORES - Extract scores from enemies and add to current score
        local myValue = self.myValue
        --print("Bang you got: ", myValue, " points" )
        currentScore = currentScore + myValue
        setScores( currentScore )

        end
    end
end