Celestia seems to be something of a collective of side-members of classic French black metal groups. And while Celestia's music is straight black metal that has nothing of the inventiveness that French black metal is sometimes known for, it's not in the least lacking in melodic creativity or spirit. I would criticise the under-developed and obvious basslines and the overuse of none-too-tight tremolo picking, but the melodies created are effective and at least there's some presence in mid and low frequency ranges.
There's some good ambience here, and that combined with the strong melodies and decent sound (this is the remastered version) make what might otherwise be an exercise in endless black metal actually reasonably enjoyable to listen to. It might not be my first choice, but is certainly not the kind of black metal that makes me want to forget that I've ever listened to the genre. All in all, a more well-developed approach with more variety, complex structures, and more interesting harmony might come off as a respectable record.