A level pack complete screen would be nice, as i keep replaying earlier levels, without realizing that i completed a level pack, as they just loop over.
Nice idea! :)
This can already (sort of) be done. The pack author can add a Postview text screen to the final level of the final group, which can be used to congratulate the player on completing the pack (e.g. Mayhem 30 Rendezvous at the Mountain contains such a screen!)
However, that doesn't account for when players might complete the levels in a different order; a likely scenario, since incomplete levels may occur earlier than the last level in the pack, and the player will then come back to those levels later.
So, OK then: let's detect if the level just solved is part of a pack, and ask for the completion status of all other levels in that pack. If all are solved, regardless of ordering, let's show a simple 'Congratulations!' screen.
I've added this one to the to-do list.
tbf, part of it is on me, as I seemingly don't realize that i'm back to the 1st level of a pack, only after a few levels, but thanks for considering my suggestion.