When you have armor left, its value is displayed over the hero's health (a shield over a heart).
In my second run get it! another wish item for me is a description for each type of card, BUT BUT I think is way better to discover that yourself you don't need a tutor for playing games you need to play the game and learn by playing it (I love way mega man X handles this "issue" on the very 1st introduction)
I love roguelike games you just keep getting better and better each run (like life itself)
keepup the good work Watabou!