Why is my custom movement script extremely wonky?

So basically I have this script where it swaps the players body then has a movement script, however the moving is extremely wonky and doesn't work as well, aka. It's not going in correct directions sometimes and you dont move the direction you're zoomed to, help would be appreciated. Here's the script;

wait(3)
-- Declare varaibles
local userInputService = game:GetService("UserInputService")
local runService = game:GetService("RunService")
local player = workspace.test
local moveVector = Vector3.new(0,0,0)
 
userInputService.InputBegan:connect(function(inputObject)
	if player then
		if inputObject.KeyCode == Enum.KeyCode.A then
			moveVector = moveVector + Vector3.new(-1,0,0)
		end
		if inputObject.KeyCode == Enum.KeyCode.D then
			moveVector = moveVector + Vector3.new(1,0,0)
		end
				if inputObject.KeyCode == Enum.KeyCode.S then
			moveVector = moveVector + Vector3.new(0,0,-1)
		end
		if inputObject.KeyCode == Enum.KeyCode.W then
			moveVector = moveVector + Vector3.new(0,0,1)
		end
		if inputObject.KeyCode == Enum.KeyCode.Space then
			player.Character.Humanoid.Jump = true
		end
	end
end)
 
-- Handle inputEnded event (when player releases a key)
userInputService.InputEnded:connect(function(inputObject)
	if player then
		if inputObject.KeyCode == Enum.KeyCode.A then
			moveVector = moveVector + Vector3.new(1,0,0)
		end
		if inputObject.KeyCode == Enum.KeyCode.D then
			moveVector = moveVector + Vector3.new(-1,0,0)
		end
						if inputObject.KeyCode == Enum.KeyCode.S then
			moveVector = moveVector + Vector3.new(0,0,1)
		end
		if inputObject.KeyCode == Enum.KeyCode.W then
			moveVector = moveVector + Vector3.new(0,0,-1)
		end
	end
end)
 
runService.RenderStepped:connect(function()
	if player then
		player.Humanoid:Move(moveVector)
	end
end)

Thanks.

Note: Game is filtering enabled, script is in ServerPlayerScripts and I want this system to be kind of like before the dawns system of forcing a player to play as a certain killer.

The issue is pretty obvious. You're moving in a set vector direction not taking into account their current lookVector. Bla, bla bla. Piece of advice, scratch what your doing, IF you're trying to replace the rig. Make a new rig/character, place it in (I think) starterplayercharacter. Look up a tutorial on custom rigs if you don't get the specifics, it's very simple.

Moving in a Vector3.new(1, 0, 0) direction, if I'm not wrong, will only move the player either right or left in a set x-axis, not in the actual direction they're facing. For example, if you're facing north, and let's say that works, if you face east.. Well let's say that's when things get "wonky".