Spiral knights has almost no presence in the internet nowadays, we aren't even mocked by encyclopedia dramatica, and we are still bleeding members. Solve this problem with the only way it can be. Advertising. Create merchandise, advertisments, anything that bigger videogames do. We're in a position to get new knights, and this is sort of necessary to combat that gloom that pervades everyone I meet.
Sega Networks LLC doesn't want to put out another TF2 hat I guess. Weird that they haven't though. Make a hat unlock when you do a dauntless delver run, and you'll drive the tf2 community insane.