Fireattack2 (Wave Script)

frame = 0
variation = 0
bullets = {}
balls = {}
function CreateBullet(x, y)
  local bullet = CreateProjectile("Tomas/Fireball 1", x, y)
  bullet.sprite.SetAnimation({"Tomas/Fireball 1", "Tomas/Fireball 1B"}, 1/5)
  bullet.sprite.rotation = 180
  table.insert(bullets, bullet)
  bullet.SetVar("spawnframe", 0)
end
function CreateBall(x, y)
  local bullet = CreateProjectile("Tomas/Fireball 1", x, y)
  bullet.sprite.SetAnimation({"Tomas/Fireball 1", "Tomas/Fireball 1B"}, 1/5)
  bullet.sprite.rotation = 180
  table.insert(balls, bullet)
  bullet.SetVar("spawnframe", 0)
end
function Update()
frame = frame + 1
        if frame % 5 == 0 then
           local xPos = -Arena.width / 2
           local yPos = -Arena.width / 2 + 5
           CreateBullet(xPos, yPos)
        end
        if frame % 20 == 0 then
           local xPos = -Arena.width / 2
           local yPos = Arena.width / 2 + 50
           CreateBall(xPos, yPos)
        end
for i = #bullets, 1, -1
do
   currentBullet = bullets[i]
   currentBullet["spawnframe"] = currentBullet["spawnframe"] + 1
  if currentBullet["spawnframe"] <30 then
   currentBullet.Move(5, 1.1)
  elseif currentBullet["spawnframe"] <60 then
   currentBullet.Move(-5, 1.1)
  elseif currentBullet["spawnframe"] <90 then
  currentBullet.Move(5, 1.1)
  elseif currentBullet["spawnframe"] <120 then
   currentBullet.Move(-5, 1.1)
  end
  for i = #balls, 1, -1
  do
  currentBall = balls[i]
  currentBall["spawnframe"] = currentBall["spawnframe"] + 1
  if currentBall["spawnframe"] <30 then
   currentBall.Move(5, 1.1)
  elseif currentBall["spawnframe"] <60 then
   currentBall.Move(-5, 1.1)
  elseif currentBall["spawnframe"] <90 then
  currentBall.Move(5, 1.1)
  elseif currentBall["spawnframe"] <120 then
   currentBall.Move(-5, 1.1)
  end
  if currentBullet.y > 170 then
   currentBullet.Remove()
   table.remove(bullets, i)
  end
  if currentBall.y > 300 then
   currentBall.Remove()
   table.remove(balls, i)
  end
 end
end
end