Why doesn't this script make me levitate and then move to my target location?

The code is for some rocket boots but they are not currently working, this is my local script in the starterGui:

player = game.Players.LocalPlayer
spacedown = false
mouse = player:GetMouse()
startedDown = 0
character = player.character

mouse.KeyDown:connect(function(key)
    if key:lower() == " " then
        spacedown = true
        startedDown = tick()
    end
end)

mouse.KeyUp:connect(function(key)
    if key:up() == " " then
        spacedown = false
    end
end)

function Elevate()
    if character["Left Leg"]:findFirstChild("Rocketboot") ~= nil and character["Right Leg"]:findFirstChild("Rocketboot") ~= nil then
        if spacedown then
            print("Was held for ", tick() - startedDown,"seconds")
            -- Time between now and when `startedDown` was set
            if tick() - startedDown > 2 then -- If held for longer than 2 seconds
                local float = Instance.new("BodyVelocity", character.Torso).force 
                float.Parent.name = "float"
                float = Vector3(0, 196.2*character.Torso:GetMass(), 0) -- Apply force to make the character levitate
                local body = Instance.new("BodyVelocity",character.Torso) --Create BodyVelocity and Parents it to Player's Torso.
                body.name = "Body"              
                body.maxForce = Vector3.new(1e7,1e7,1e7)--The the Maximum amount of force the BodyVelocity can use.
                body.velocity = character.Torso.CFrame.lookVector*40*2--Change the Body's Velocity to the way the Character's Head if facing.
                character["Left Leg"]:findFirstChild("Rocketboot").Thrust1.Transparency = 0.5
                character["Right Leg"]:findFirstChild("Rocketboot").Thrust2.Transparency = 0.5
            end
        elseif not spacedown then
            character.Torso.float:remove()
            character.Torso.body:remove()
            character["Left Leg"]:findFirstChild("Rocketboot").Thrust1.Transparency = 1
            character["Right Leg"]:findFirstChild("Rocketboot").Thrust2.Transparency = 1
        end
    end
end

spacedown.Changed:connect(Elevate)

Please can you tell me of any point in which my code is inefficient or could use improvement, currently the error is on line 5:

11:07:11.442 - character is not a valid member of Player 11:07:11.443 - Script 'Players.Player.PlayerGui.LocalScript', Line 5 11:07:11.444 - Stack End