Another question then:
Is the system the same as in DD: how higher my Level how less experience for hack'n Slash, but more for doing Quests?
A bit different now - each quest has it's own "EXP measure". For example, first quest for Locke (the merchant). You can finish it right from the beginning and get xxx points of exp, or, you can kill everyone in the Valley, then finish the quest and you will get xxx+xxx EXP points, but not over 1k.