Really fun game but way too easy imo. The items should be more rare or more expensive because it's very easy to get a lot of them and become basically invincible by floor 3. Great concept though!
Changing the numbers can't change anything. The very idea that you can simply press LMB to defeat everyone does not provide opportunities for developing difficulty. The maximum that will change is that the ability to kill a monster will become a luxury, but you will continue to press the mouse steadily.