Could do with instructions, I don't know if I was doing it wrong or I was bugged but I didn't seem to be able to attack most of the time and after a death the mobs were on me before I could get oriented and look at the cards I'd drawn and then I died.
On top of instructions it would be good to ease the player into the mechanics of the cards and the different abilities and possibly costs? It looked like they had costs but it wasn't clear
Viewing post in 23 Deaths From Hell jam comments
Give the game another try, theres no costs in the game, but cards have different cooldowns. In general the more powerful cards have longer cooldowns, and the cards should turn grey when they cant be used, which was probably what you were talking about. There are instructions on the game page on itch