Why does this work in studio but not in game?

This script is inside a rock, and when you touch it without a ForceField, it's supposed to take 100 damage away. When you touch it and you DO have a ForceField, it's supposed to destroy it's self and have a 25% chance of giving you 100 points. If the rock doesn't touch a person, but it touches grass or a different rock, it's supposed to have a 33% chance of staying on the ground.

debounce = false
script.Parent.Touched:connect(function(hit)
	if not hit then
		print 'gg roblox'
		return true
	elseif not hit.Parent then
		print 'gg roblox'
		return true
	end
	local h = hit.Parent:FindFirstChild("Humanoid")
	local ff = hit.Parent:FindFirstChild("ForceField")
	local p = hit.Parent:FindFirstChild("Grass")
	local p2 = hit.Parent:findFirstChild("Rock")
	local rl = hit.Parent:FindFirstChild("RocksLeft")
	if h then
		print 'humanoid found'
		if ff then
			print 'ff found'
			print (hit.Parent)--Player
			local points = game.Players:GetPlayerFromCharacter(hit.Parent):WaitForChild("Points")
			if rl.Value ~= 1 then
				rl.Value = rl.Value - 1
			else
				rl.Value = 0
				ff:Destroy()
			end
			local var1 = 1
			local var2 = math.random(1,4)
			if var2 == var1 then
				points.Value = points.Value + 100
			end
			script.Parent:Destroy()
		else
			if debounce == false then
				debounce = true
				h.Health = h.Health - 100
				print 'rip'
				script.Parent:Destroy()
			end
			wait(.5)
			debounce = false
		end
	elseif p or p2 then
		local var = math.random(1,3)
		if var == 1 then
			script.Parent:Destroy()
		end
	end
end)

The problem is that when you do touch it with a ForceField, it says:

attempt to index local 'rl' (a nil value)

Even though I'm asking for a IntValue named "RocksLeft"

Another thing is, when the rock hits the ground it doesn't destroy. None of them do. Even though there are a lot spawning each second

while true do
	wait(.05)
	clone = game.ServerStorage.GameRock:Clone()
	clone.Parent = workspace
	clone.Position = Vector3.new(math.random(-255,255),math.random(150,200),math.random(-255,255))
end

Perci's answer is correct about one issue, but there might be another problem here.

Line 14: local rl = hit.Parent:WaitForChild("RocksLeft")

The WaitForChild function will wait forever until hit.Parent gets a child object named "RocksLeft." This means that when your object is touched and fires your listener function, it will always freeze at line 14 if there is no RocksLeft object. This is fine if you only are dealing with Touched events from objects that have a RocksLeft object, but I'm guessing you also want to deal with other objects too.