I think I'm just awful at these kinds of games 🤣 born and bred FPS kid.
I couldn't keep my health bar high enough, and it seemed to stay at the midpoint or below for the duration of my playtime, possibly because I had too many cards drawn to fight with? I wasn't sure how to top it up, and took too many risks to gain the low amounts of health on the board, and ended up dying by running out of cards. Hope that helps!