I'm not sure how anyone could not feel unstoppable. After a few upgrades to the shield recharge and ray damage you will never see your shield go down.
Great game and one of few I stayed around long enough to earn all in-game awards.
To get Lone wolf ensure you complete the following (not in this order, be mindful of how many times you travel around. There is barely enough to get all this done):
Find all four bullets and load them -Have the ax -Brick the window -Repair the fence -Use the generator on the fence -Close and lock the door -Kill Bill with the ax -Hide in the basement -Close the Latch
To get Lone Wolf, ensure you do the following before the day is over:
Repairs the fence
Powers the generator and connect it to the fence
Brick up the window
Kill bill with the ax
Close and lock the door
Hide in the basement area
Close the hatch
Ensure you have and load 4 bullets
Have the ax
Not huge fan of these games myself, but everyone needs to stop whining. It's only three days to get the badge. An idiot can get this badge within ten minutes. If you hate these games that much, don't play.