Hello! And no the group is most definitely closed, though, for members that have been accepted into the group, they're allowed to submit characters and apps at any point in time regardless of whether or not there is an opening. That, and there are a few people who have asked for and been granted an extension while they work on their apps, and thus were allowed to join the group a bit later.
I hope that, I've been able to answer all of your questions,
- Onyx o v o /)