What should Lesson 5 be?

As I'm sure is obvious, this project is being done very much on the fly.  I'm inventing the lessons as we go, and especially with the relative infrequency of the lessons, it's hard to keep continuity.  So I found myself struggling a bit with what to do with lesson 5.

• The Monster could use more help with math.  She's struggling with some math concepts in her regular school lessons.  Should I create a programming challenge around math?
• There are lots of programming concepts that are just barely being brushed.  Variables are a key example.  Should we be building more logical concepts?
• The Monster is really engaged by her "going to the market" prototype.  Should I encourage her creativity and nascent procedural authorship?

I already know the answer of course :).  I'll take door number three please.  While I love the potential of programming to teach math and logical concepts, my bias is toward programming as a mode of expressiveness.  When I saw The Monster get so excited by her little arrow-keys drama in Lesson 4, I was thrilled.

So for lesson five, we'll work on the drama... what if we actually showed the mysterious enemy that is apparently scaring The Pear away from the market?  And what if the player could make that enemy appear or disappear as a mechanic?  That will be our next lesson.