Unlimited Exp. Points
Just *google* some lesson/tutorial how to work with cheat-engine.
It's really that simple..
[1.] Start the game and press Escape, go to upgrades to check how many points you have(REMEMBER THE NUMBER or type it somewhere)
[2.] Alt+tab and start "Cheat engine", next select prototype's process/exe and search your points number (use the "first search" button this time)
[3.] return in the game (Alt+tab - wait for a while... probably it will take some time showing you a beautiful black screen :)), O.k. you are in game now.. GO AND KILL/DESTROY some military unit no matter it will be a soldier or a tank.. (just a suggestion: next RUN away out of their range) this will give you some points, yet again go to upgrades and check your points number and remember it, ALT+TAB and go to cheat engine again, type the new number and use the "second search" (woow... you are almost done..) you'll see several numbers in the left side of the program double click all of them and they will be added in the list below, NOW click on the number of your points(in the list below..) and change the number to.. for example: 9,999,999. (add all lines in the left list up... so all of them to be seen in the list at the bottom and change the points number to whatever number of points you want). That's it! alt+tab and return to the game, you'll see plenty of points ready to be spend for all the updates you could dream of.
Unlock Body Surfing
Select "Extras" from the Main Menu and go to "Cheats"
Right, Right, Left, Down, Up, Up, Up, Down - Unlock Body Surf Ability