While Lunar is definitely a Logo, it's not compatible with older dialects. Programmers used to, say, UCB Logo -- the de facto standard -- may be tripped by a number of differences:
setitemoperates on lists, not arrays (which aren't implemented).
arrayemits a list, for the same reason.
div; there are no infix versions.
gte; no infix versions here, either.
continuemeans something else than in UCB Logo.
foreachuses an ordinary variable, while
filtertake a function.
countis extended to work on dictionaries.
Blocks of code are, of course, new to Lunar Logo, and they are used instead of lists in several places.