Well I may have to start over as I got like 80 attack power so I beat bane even in his three forms in two strikes a piece lmao.
Balance is totally outta whack, why buy weapons when training with Batgirl eventually can get you four attack points everyday? Weapons are pricey, there isn't very many of them and same with armors you should add more options, add some gadgetry (have a skill level for those Batgirl can train you, if you're willing to add it have Harley be willing to train you as well if she likes you enough).
The affection system while noted in a gauge is far to simplistic and due to lack of content kinda hard to tell when you get anywhere, of course as you add stuff for Batgirl and HQ this will change but it will need to be changed by some point.