Thanks for the feedback! The anger increase formula is
(ItemValue/2) * (angerRate + (anger / 100));
angerRate is always at 1.25, I was going to let it increase but I ended up not doing that.
I made the anger scale based on how angry the boss already is. I think it made the game feel better but idk
There is one exception to the (ItemValue/2) part and that is for the computer. I set the anger increase for the computer from 50 to 40. It felt more balanced.