Help meh

Encounter.SetVar("wavetimer", 15.5)
spawntimer = 0
bullets = {}
sprite4 = "Spikeup"
sprite3 = "SpikeDown"
sprite2 = "SpikeLeft"
sprite1 = "SpikeRight"
arenasize = {155, 155}

function Update()
 spawntimer = spawntimer + 1
 if spawntimer%10 == 1 then
	local bullet = CreateProjectile(sprite2, -0, 0)
	bullet.SetVar('type', "SpikeLeft")
	table.insert(bullets, bullet)
end
if spawntimer%10 == 1 then
	local bullet = CreateProjectile(sprite3, -0, -400)
	bullet.SetVar('type', "SpikeDown")
	table.insert(bullets, bullet)
end
if spawntimer%10 == 1 then
	local bullet = CreateProjectile(sprite4, -0, -200)
	bullet.SetVar('type', "SpikeUp")
	table.insert(bullets, bullet)
end
if spawntimer%10 == 1 then
	local bullet = CreateProjectile(sprite1, -0, 0)
	bullet.SetVar('type', "SpikeRight")
	table.insert(bullets, bullet)
end
end

function OnHit(bullet)
			Player.Hurt(1,0.02)
			Encounter.Call("AddKR")
	end