Loc: near Yosemite in California
I have never felt the need for a restart. Maybe that player was thinking that she had figured out the power-ups usage better and decided to start over for that reason. A restart never seemed necessary to me.
There might be a few levels after where you are that are a little more difficult than what you have already faced, but overall I don't think the next levels will be worse.
And yes, you have to be very careful to click on continue rather than start over!