There’s not a lot to go on when you’re making a Portal fan movie about Chell. She hasn’t a single spoken line, no surname, no origin story beyond the vaguest of general details, and only one facial expression. In fact, simply applying any extra details at all can make her seem out of character. Outside Aperture, however, does a great job not only of fleshing Chell out without giving us any more details on her, but also at presenting her struggling against shellshock of her experiences without diminishing her personal strength.
And there are amusing day-to-day thinking with portals jokes. A+