You could go into:
documents/mygames/Soma/Main/Username_user_settings.cfg
Find GodMode and change the false to a true.
Open it with notepad.
Note that if you do this, make sure to set it to false at a certain point... don't want to spoil anything, but when your elevator breaks and you use the floor hatch. There is a scripted encounter which god mode in the cfg breaks.