Custom Character Movement Controls Really Janky

Help and Feedback Scripting Support
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#1

Hi. I want to make the player character a controllable ball that can roll. I did this. I actually implemented this as well as a jump script, but the movement feels very bad and janky, and you cant control the ball when its in the air.

I was wondering how I can fix my current code to make movement better.

Here is the code:
Main Marble Movement Script:

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(char)
		local HRP = char:WaitForChild("HumanoidRootPart")
		local marble = Instance.new("Part")
		marble.Size = Vector3.new(8,10,8)
		marble.Color = Color3.fromRGB(255, 160, 94)
		marble.Transparency = 0
		marble.Name = "Marble"
		marble.Shape = Enum.PartType.Ball
		marble.Parent = char
		marble.Material = Enum.Material.SmoothPlastic
		
		local Velocity = Instance.new("BodyAngularVelocity")
		Velocity.Parent = marble
		
		local Hum = char:WaitForChild("Humanoid")
		local Weld = Instance.new("Weld")
		Weld.Parent = marble
		Weld.Part0 = HRP
		Weld.Part1 = marble
		Hum.PlatformStand = true
		
		while true do
			wait()
			marble.BodyAngularVelocity.AngularVelocity = Vector3.new(char.Humanoid.MoveDirection.z * 32,0,char.Humanoid.MoveDirection.x * -32)
			marble.BodyAngularVelocity.MaxTorque = Vector3.new(40000,40000,40000)
			if char.Humanoid.MoveDirection == Vector3.new(0,0,0) then
				marble.BodyAngularVelocity.MaxTorque = Vector3.new(0,0,0)
			end
		end
	end)
end)

Marble Jump Script

local userInput = game:GetService("UserInputService")
local players = game:GetService("Players")
local player = players.LocalPlayer
local pressed = false

local function beginJump(input, gameProcessed)
	if not gameProcessed then        
		if input.UserInputType == Enum.UserInputType.Keyboard then
			local keycode = input.KeyCode
			if keycode == Enum.KeyCode.Space then 
				if pressed == false then
					game.Players.LocalPlayer.Character.Marble.AssemblyLinearVelocity = game.Players.LocalPlayer.Character.Marble.AssemblyLinearVelocity * Vector3.new(1, 0, 1) + Vector3.new(0, 75, 0)
					pressed = true
					wait(2)
					pressed = false
				end
			end
		end
	end
end

userInput.InputBegan:Connect(beginJump)

Any help is appreciated!