Trying to make a game like cube eat cube need help with camera?

local plr=game.Players.LocalPlayer
local cam=game.Workspace.CurrentCamera
local mouse=plr:GetMouse()

cam.CameraType="Scriptable"
cam.CameraSubject=game.Workspace[plr.Name.."Cube"]
while wait() do
	local cf=game.Workspace[plr.Name.."Cube"].CFrame.p
	local size=game.Workspace[plr.Name.."Cube"].Position.y/2
	game.Workspace[plr.Name.."Cube"].CFrame=CFrame.new(cf.x,size,cf.z)*CFrame.Angles(0,0,0)
	game.Workspace[plr.Name.."Cube"].Velo.velocity=(mouse.Hit.p-game.Workspace[plr.Name.."Cube"].Position)*Vector3.new(1.5,0,1.5)
	cam:Interpolate(game.Workspace[plr.Name.."Cube"].CFrame+Vector3.new(0,game.Workspace[plr.Name.."Cube"].Siz.Value*0.8+20,0),game.Workspace[plr.Name.."Cube"].CFrame,0.01)
	local val=game.Workspace[plr.Name.."Cube"]:GetMass()*100
	game.Workspace[plr.Name.."Cube"].Velo.MaxForce=Vector3.new(val,val*2,val)
end

It is very glitchy how can I fix that? You can see for yourself here: http://www.roblox.com/games/315301083/Minigames

This is a suggestion of a different way to fix it:

You could use camera.CoordinateFrame, which is basically changing where the camera is positioned, and where it is looking. It uses CFrame. E.G:

local cam = game.Workspace.CurrentCamera
-- inserts a part to look at
local part = Instance.new("Part",game.Workspace)
part.Anchored = true
part.BrickColor = BrickColor.new("Really black")
part.Position = Vector3.new(0,10,0)
-- while loop to change where the camera is facing
while wait() do
	cam.CoordinateFrame = CFrame.new(game.Workspace.Baseplate.Position,part.Position)
end

CFrame values basically go like this:

Argument #1:

Vector3 value, position of the camera, in the script above, it makes the position of the camera the same as Baseplate's position.

Argument #2:

Vector3 value, what the camera is looking at, in the script above, it is looking at the black Part.

For more info on CFrame: http://wiki.roblox.com/index.php/CFrame

When trying to be above a part that is moving, you need to have the first argument of CoordinateFrame's CFrame to be in the same position of the part that is moving, so you can always see it, and that it is in the center of the screen. Like so:

local p = game.Workspace.TestPart
p.Anchored = true
local cam = game.Workspace.CurrentCamera

while wait(.01) do
	p.Position = p.Position + Vector3.new(0.01,0,0) -- moves it on the X axis.
	cam.CoordinateFrame = CFrame.new(p.Position + Vector3.new(0,10,0),p.Position )
end

This script should move a Part on the X axis every hundredth of a second, and make the camera look at the Part. Also, the reason I am adding to the CoordinateFrame's first argument is because I want to see the Part, not look at it while inside the Part (which is basically impossible).