This was an interesting read! I like how playing cards and dice were used to form the primary mechanics. You will have to balance out your options and go with the randomness of the dice. Also cool to see the main character is the healer instead of the warrior. A nice spin on the adventure story. I also enjoy how monsters roll different amounts of dice depending on the situation.
Have you considered adding in a leveling up system for the Little Warrior and the healer? Maybe a set of extra abilities they get for defeating major bosses or completing milestone events? That way each player can customize their healer. It will also provide an incentive to play again and try different styles of play.
Also just a quick question - does DMG stand for something specific? I believe you defined it as the number of six sided dice you get to roll. Higher DMG = higher potential to hit. Is that right? I play a lot of Dungeons and Dragons and every time I see DMG I read it as "Dungeon Master Guide". What does DMG stand for in your game?
Thanks for making your game!