It better be Legs, arms, head and torso only, It's ok for the first version to have those features, No need to stop the game but If you could it would be better, Also what do you mean circle menu on the center of the screen?
It's good to switch between body parts with WASD.
My PC Specs:
Intel(R) Core (TM) i5-2400 CPU @ 3.10GHz 3.40GHz
RAM: 8 GB
GFX: Nvidia GT 440
OS: Windows 7 32 bit