Loved the game! A fresh idea implemented smoothly, with nice artworks fitting the theme. I had some good time playing this :D
The only thing that made me perplexed is the "revealing" action of what's hiding in the dark: it's a clever twist on the theme (a card can both help you or become the enemy you need to defeat: fantastic!), but it felt a bit random to me. Is there a logic behind the association front/back that I'm missing?
Anyway, great submission!