This controls are the controls that the developer hidden from us so we could go hunting for them. Here are all the ones I know.
T = slow time
V = Melee Attack
C or Mouse wheel = Thirdperson
Q = Moves the camera left
E = Moves the camera right
Z = Changes Firstperson shooting mode
These are all I know. I will update it with new controls when I find new ones.

These controls are the unhidden controls that are not secret. As seen on store page.

Originally posted by jack:

Control keys:
Right-click targeting
WASD movement
The left Shift running
Left mouse button attack
Space leaping
The left Ctrl squats
Mouse control direction
R Loaded Weapons
G the bomb
Middle mouse button switch weapons