morph ball help

i am new yes but only to this forum

not to blender in general

see i have a problem with my game…i want to make a metroid game here is my crrent progress…but i have ran into a problem see i wanted to make it so if you pres control you go into the morphball. I have a sorta system for this already but its incomplete. I cnt accually turn into the ball. for right now all it does is mae your camerazoom out you not able to shoot and turns the box invisible.

if you must here is my .blend file so you can see what i did
http://www.mediafire.com/?sharekey=7131c38373d5b14fd2db6fb9a8902bda

so tell me how i would ull it off?

left cntrl to go into morphball you turn into a ball able to move and then if i press left cntrol again it goes back to normal…

if yur interested this is my progress video for the game so far
http://www.youtube.com/watch?v=_jAPGy-rWJo