Amazing idea!
Summary: This flash is really good. If you are not a programmer you could find out in a fun way that you are one, and if you already are you enjoy it immensly.
Thumbs Up:
1. Not hard to figure out things.
2. Challenging.
Like to have:
1. Advanced stuff such as recursion and maybe loops could be really nice to have but really its fine as it is!
2. More levels :)
Other:
I liked this game so much I actually registered into newgrounds (before I was a lurker). P.S. If you are using a domain specific language I would suggest having a look at Haskell. ;) In fact your game me a terrific idea for a project of mine :P
Continue working on games like this!