Thanks a lot for trying it out :)
As for the difficulty, there is one very important thing - and that is to level up your runes (i.e. complete rune mastery challenges). It makes a world of a difference :) I guess this means I need to communicate this better, like a huge popup message the first ime you die... "GO LEVEL YOUR RUNES" lol :) So most probably the issue was that you were underleveled for that fight.
As for the sounds - I am thinking about that... this is my first game ever, so I am learning everything as I go, and I simply have not yet gotten to learning how to do audio :) Although to be fair I wasn't even thinking about sound effects - I was thinking more in the direction of background music (some more dynamic during combat and something more peaceful outside combat).