He's seriously not trying to score them on their game scores! First of all, people were given randomized characters with uneven qualities at the start of the game, just like life itself isn't fair in that way, and second, he's watching to see if people play according to their incentives, not whether they get higher scores than other players.
...he's not sure what's going wrong with the way that nobody's having fun. Maybe just the sheer cognitive load associated with not really instinctively feeling what's going on and not having pre-learned brain patterns for this complicated game? He should maybe back off of this soon, then, and only re-approach after playing simple games with shorter-term real rewards associated with good play, or something, like if they're doing it on a playground, or the adult equivalent of that. He doesn't want to train his students that simulation games aren't fun.
"So this game wasn't a very realistic one - for example, you knew all of your characters' genetic information locus by locus, where, for a more realistic game, we should've had some Game Masters who only told you a character's total Intelligence score, didn't tell you anything about the specific loci, and generated new characters for everyone after each mating. Nonetheless, for this unrealistic version, around how valuable was Thelkam?"