I loved the concept! the only thing i think could have been better is the final battle, which i thought was a bit drawn out. also, since the player can only either heal or attack, they kind of have to just hope for the best, and not choose much. If you ever want to expand on this idea or recreate it or whatever, I would add another element of choice to it. I don't want to impose any particular idea on to you, but you could use this as the combat and then have another element of the game, where the player has more choice, such as where they go. Loved the story as well :)