Here are the steam player numbers for Spiral Knights since August 2012.
http://steamcharts.com/app/99900#All
---The +165 avg. players in Nov. '12 is from the GH update, which returns to avg. levels in 2 weeks.
---The +1275 avg. players in August '13 is from the Sprites update, which returns to normal levels in about a month, right before DH festival AND Apocrea kick off on 10/23 to knock it back up about half as high as the week of BS. Notice how the Arcade Redux phase 1 update, the week before DH, gets no player bump whatsoever.
---There is a small uptick in players in December, presumably from holiday breaks from school/work and winterfest having actual difficult content.
---Since Winterfest ended, the number of players has been slowly but steadily declining despite only ~20 days where there was not some sort of energy prize box promotion running.
---The Tortodrone update did not draw any significant amount of players, and coincidentally only had one new playable level with only one room.
Summary: Only the biggest updates, which occur once a year usually in the 3rd/beginning of 4th financial quarter (SLs for 2011, GH for 2012, BS for 2013, Gunner for 2014) draw significant upswings in player numbers. Those updates keep players longer if they have take longer to play through and have more gameplay-focused content, but still only keep players for 1-2 months. Without fairly consistent game content updates, the playerbase declines and has been doing so for the last 6 months.
Not quite #dedgaem, but getting there.
Though I do agree that the playerbase is quite small for a game like SK. (What, something like 3k-4k?) I think you should include the charts of non-steam players. Now that's impossible, because there is no such place to get that info from, so we can't really say for sure that SK is dying....
#SortOf#Somehow#About#DedGaem#I#HopeNot#TooMuchHashtags