Yeah It's hard to do balancing for a game with random factors so there probably are losing hands. It also started out with being able to just keep spamming the left most card to win the game. But trying to diminish the spam strategy led to hands that may not be beatable.
Viewing post in Dangerous Deck Game jam comments
Originally I was going to have the player move around and defeat enemies in real time using a deck of cards they build up but the enemies and environmental hazards would add bad cards into the deck that the player would have to deal with. So if I continue the game I'm going to try to implement some more real time elements. So far there isn't much reason to pay attention to what the enemy is doing at any given time.