When visiting the cart page with product in the cart that is using points, the user is always greeted with the following message:

You will save a total of $0.00 using 0 points!

From looking through the code, the problem appears to be that you reset the $saved and $points variables at the beginning of every loop. It appears like the desired effect can be achieved by moving the $saved = 0; and $points = 0; to just above the foreach loop (line 170).