It has a number of similarities to Elfen Lied stuff:
-female prisoner escapes gov secret experiment
-she is telekinetic and kills in that way
-she is traumatised by cat torture
-generally a weirdo
-calls the experimentor as 'papa'/father; unceremoniously kills others but not him
Ok, some other stuff are not there, because JAPAN, and:
-heroine in Elfen Lied is basically over-sexualised
-nudity is a main theme of that show
-gore reaching ridiculous splatter levels
I have to assume they were aware of Elfen Lied -- not that it makes any difference in how i view the show (i didn't particularly like Elfen Lied either, but for different reasons
)