-Tooltips while mousing over cards, there's no way to tell what any of the cards do.
-You need some level of differentiation between monster/spell cards based on card visual.
-"Starting actions" is a bit unclear when selecting a character, might want to call it starting cards or just deck.
-Some kind of indicator as to which targets are able to be hit by certain spells.
-Any rule as to ordering? Enemy seems to always attack first before playing cards.
-You need an indicator for when the ai is finished and your turn has started.
-Mana amount never increases? Maybe this is what you're going for but I think that needs explained to some degree because it goes against typical tcg affordances.
-No real choice to be made. Since you have infinite copies of all your cards, you basically just kill units > hit face until you get lethal.
-Coins exist but what do they do?
-End turn button collider is far larger than the button visual.