The small deck size may sound restrictive, but in practice makes for quite an intricate system as each character has a different role to play, such as being a mage, a physical damage dealer, or being a support-based character, with their specific cards based around their character’s traits. You have a few different cards at your disposal, ranging from basic physical attacks to magical element based attacks and party buffs, to healing cards. The beauty of this system is the ‘Steam Pressure’ mechanic (pun intended) that builds up when you use weaker basic cards, and will then allow you to use more powerful cards that will each require a portion of the steam gauge to play.
This creates a wonderful balance of playing basic cards and weighing up which of your more powerful cards to play and how much of your steam gauge you will use, as being left with no steam gauge and a handful of cards requiring it can be quite a punishing experience. You are able to send back and redraw up to 2 cards per turn though, but this will by no means save you if you plan out your cards and actions poorly.