I think a nice little touch to the game would be a daily/weekly/monthly seeded challenge map. The arcen server would list a map/seed/starting position/enemy AIs/plots that would be the same for every player, then players submit their scores/how far they got/how long it took to the server automatically.
this would have a number of community benefits, like giving a common point for discussion and competing with your friends. it could also be used to test balance or mechanics.
/inspired by Tomb of the Necrodancer