Here the dialogue box size depends on the amount of text it has to display.
Right now, font size is hard-coded so I need to make all text printing functions more flexible. Improving readability by testing larger font is definitely worth the effort.
It's probably also worth cheeking the ratio screen-height/font-size of other games. With the current font, we can fit 64 lines on the screen height. It was OK for a strategy game like MinST but seems too much for an action RPG.