There is quite a bit more to Logo than turtle graphics. It is a complete programming language; essentially a dynamically scoped m-expression Lisp with support for fairly sophisticated functional programming[1]. In what way is your system "much higher level"?

[1] http://www.cs.berkeley.edu/~bh/v1ch0/preface.html

Sorry - I had logo, and the turtle robot's that run it, mixed up:

http://en.wikipedia.org/wiki/Turtle_(robot)

I was comparing the turtle robot I used when I was younger to the Robotiky robot (I appreciate that it is also possible to build a very sophisticated turtle robot).