I suppose my experience was similar, but what really lost me was that this "revolutionary" game that was supposed to be so different from the standard fare was running on Flash taking up all my CPU cycles. Even back in 09, I was sick of it (but I was sick of all Flash in general). And of course, that's one reason they cited for their closing, and possibly a large reason.
I play flash games all the time on Kongregate, and 9 out of 10 make my laptop sound like an helicopter, but I keep going back, and so do a bunch of people, from what I can see.
Glitch was not the case, and even if it were I doubt flash performances may be an issue for why users didn't get in the game. The game was just terribly boring.
Of course, there are plenty more sensible reasons for giving up flash, but "the continued decline of the Flash platform" seems more like "game does not run on iPad".
Replying to myself... but on that same note, we can look to Jagex and note their sustained success with Runescape, perhaps the "original" in-browser MMO. More impressive is that it's Java-based and has been since 2001, yet they've continually updated it to run on more powerful hardware.
