The game is good, but the clarity of explanation is really bad. I think a priority before releasing this would be finding someone to QA your game and give feedback on where explanations need improving.
It's quite unclear in the rewards which things will be added to hand and which will take effect immediately. It's often unclear exactly how spell cards work. Divine light gives no indication it will decrease your armour after use (does it halve your armour and round down the result; this seems to be its effect so far as I can tell) In general it's unclear whether an effect will round up or down. It also isn't clear that 'after each turn' means after turning over a card; I also expected it to take effect after attacking an enemy. Sometimes increasing max HP also increases current HP by the same amount, sometimes it doesn't and I can't tell what makes the difference between the two cases. Perhaps you could also let the player know in the tutorial there's a shop before every 5th level.
On an unrelated note, it would be nice to add the capability to re-order cards in your hand so the player can organise them instead of having them always ordered by time acquired.
I hope this criticism doesn't give the impression I dislike the game; it's really good, just massively held back by weak card text.