It took me a lot of tries and over 200 deaths, but I got the victory screen with no help! I love how Portal-inspired this is, definitely captured the spirit of the GLaDOS character. It was tempting, but I hung in there, got my good ending...and then restarted just to click the give up button to see what happened.
All in all, a very cleverly put together game, definitely worth the challenge if you're stubborn like I am. Don't give up!