Borrows heavily from . . .
. . . elements used in LOST.
"Tabula rasa" -- this latin term was also the title of a Lost episode.
The Black Smoke -- LOST!
The purgatory/afterlife and judgements on moral character -- LOST.
I guess there's only so many ideas a writer can have on the theme of what happens after death, a bit like there are always going to be pieces of music that sound similar to other pieces of music. But really, this is so packed with stolen ideas from Lost that it's hard to watch it without thinking how much it's borrowing from stuff that's been utilized already.