Pretty cool, my issues:

  - The code box can't be resized.
  - You have to read the 'tip' every time. It contains core api and not just tips.
  - Some characters aren't in the map key (archer)
  - It's a little shy on instructions.

What would be awesome:

  - To see it run through your code in realtime with the healths and points displayed.

But honestly it's a really awesome concept and was fun to play even for someone who already knows ruby.