So I’m a classics major, and this is straight-up my jam.

I’m not sure how much work you did on the classes, but I do have a couple ideas--the officer class (Centurions?) could have moves that give other party members +1, the velites would be the sneaky guys, etc. When it comes to magic, you could maybe have one class and split it--some moves are priest/priestess-like, some moves are more hedge sorcerer/sorceress? Alternatively, the priest/priestess could be the class for magic and charisma, geared towards buffing (auspices!), while the sorcerer/sorceress could be more geared towards straight-up damage dealing (curse tablets). Also, Rome was a pretty restrictive society, so you might want to consider having the for-real magic alter the social dynamics in some ways, to give players a little more freedom.

Apart from that, I’ve got some questions:

• What specific period are we talking about? Cause there’s a big difference between the army under Augustus and the army under Caracalla.
• What kinds of threats? I personally am more interested in freaky monsters than straight-up conquering--I like the idea of throwing legionaries at enemies they were never meant to face.