spawntimer = 0
bullets = {}

function Update()
    spawntimer = spawntimer + 1
    if spawntimer%5 == 0 then  --This happens every 30 frames.
        local posx = (50 - math.random(100))*5 --Set a random X position between -30 and 30
        local posy = 300 --and set the Y position to 65, on the top edge of the arena.
        local bullet = CreateProjectile('bullet', posx, posy)
		xHor = -posx/100
        bullet.SetVar('velx', xHor) -- We'll use this for horizontal speed.
        bullet.SetVar('vely', -10) -- We'll use this for fall speed. We're starting without downward movement.
        table.insert(bullets, bullet) -- Add this new Bullet object to the bullets table up there.
    end


    -- This part updates every bullet in the bullets table. --
    for i=1,#bullets do -- #bullets in Lua means 'length of bullets table'.
        local bullet = bullets[i] -- For convenience, so we don't have to use bullets[i]
        local velx = bullet.GetVar('velx') -- Get the X/Y velocity we just set
        local vely = bullet.GetVar('vely')
        local newposx = bullet.x + velx -- New position will be old position + velocity
        local newposy = bullet.y + vely
        bullet.MoveTo(newposx, newposy) -- and finally, move our bullet
    end
end