I would recommend playing casual as well. Without the free keys i would have been taped very soon.
The information about the enemy was very useful. both, there attack and the total amount of damage the player would receive if he attacks. It helped me a lot.
The facet that the shrines get stronger is problematical in my eyes. I guess it would be better to keep the bonus-cost ratio the same. Because the enemies at higher stages loot more gold, the player can buy more bonuses at the shrines.
The treasure-chambers didn't make any sense for me. The demo wasn't long enough for me to buy even one treasure. I had only one pickaxe and the lucky coin i wanted to get costs 10 soul stones. Problematic if the player can only gain 6 stones in the demo.
All in all well made but just a demo, so 4 out of 5