Levitation with object

I have good idea to make better the gameplay, but my realization it’s wery complicated.
Here my conception (video)

and realization (blend) Use right mouse buton to levitation with cube

Can anybody make a better way to realize this?

HEY! i recognize that level! but, its a cool file, and even a cooler video!

That reminds me of the Gravity Gun from HL2.