In addition to what Chuck says - there should be a running tally of the overall score. If you set up a course with multiple assessments then use the debugger/console to check Adapt.assessment - specifically I think you want the object returned by Adapt.assessment.getState();

As mentioned in the README there's a few events you can hook into as well. You'll likely have already seen assessments:complete since that's what assessmentResults uses - but there's also assessment:complete - which is for when all of the assessments have been completed (and yes we know the naming is a bit confusing).