What about adding a Bestiary? Where it says the monsters you have killed, at lvl 00-10 it's only slime. There would be a photo of the monster , a brief description, and how many slimes you have killes, maybe also hom many hits it takes to kill it....
It would be cool if, each 10 normal monsters, a mini-boss appeared that gave you 10 coins. And each 10 mini-bosses ar Boss appeared that gave you 1 diamond to buy special items...
 "Amorphous+"){kind=icon}
 "Cell Warfare"){kind=icon}
 "A Knight's Story"){kind=icon}
 "Runescape"){kind=icon}
 "Nintendo Killer"){kind=icon}
 "Hands of War"){kind=icon}
 "Submachine 1: the basement"){kind=icon}
 "Submachine 3: the Loop"){kind=icon}
 "Ayumilove HackerStory V1"){kind=icon}