I really liked that battles happens in popups. Popups are always a throwback. =D
I also liked some aspects in design, such as after attacking, you can run away before you get hit (I cannot remember if I've seen this before) and also it's cool that your HP comes back to full every battle. It encourages player to get deeper inside the cave instead of buying loads of potions. =)
Graphics are pretty, however there are some lines that annoys me in tiles (I don't know if this is only in my case.
Thanks for making it. ^^