Loving the game! The *only* thing on my Xmas list is some form of distributed vs random loot in the first 5 levels. I did just beat Goo without a health potion, but that was the 1st time in MANY games ... I'm embarrassed to say how many (I've beaten Goo at least 15 times, but never without a health pot). I was able to defeat it using Firebolt Wand, but often I feel there is just no chance and I do everything I can to stock up on health pots.
That being said, once you know what you're doing, you can get to Goo in 15-20 minutes and faster if you're really on the ball, then it isn't that big of a deal to start over, just frustrating.