Another suggestion: The start of the game is kind of boring, because it's always the same. How about randomizing the player deck slightly? For example, give them 3 Flash, 3 Moon, and 2 other random cards among the unlocked cards? This can potentially give an overpowered start, but it's a pretty random progression anyway. Perhaps limit it to only purple (special) cards and not any with latex, so you don't start with for example Girldick.