at the moment it only shows one person in the match (hence, prototype). Try going in a game with less people, if the person it works on is quite far away they could be tiny. The pictures I took were taken in the mp_shipment map in a one on one game.
And remember, it's only a proof-of-concept, a prototype. I wouldn't consider it useful, but it shows that it's possible on macs too. Once I've finished the advantage tool completely, I may see about writing up a full wallhack that shows all enemies at once. But that depends on available time...