Activity points are screwed as of 1/16/2014 - no longer possible to get 50 points a day without PVP or grinding out all the daily quests-which also requires PVP. (Unless I'm missing something). Waiting for PVP takes too long. At least before we could limp along and earn a purple card every 7 days...
Buggy - in final level with first Grand Walker, i dragged a cannon down to upgrade it and the action froze; music still plays and I can sell things, but cannot buy/upgrade/unfreeze anything.
If your spell icons disappear (the ones you get by clicking your hero), you probably have to quit and reload the page to fix it. Irritating annoyance; otherwise a very nice game.
 "Bot Arena 3"){kind=icon}
 "Rise of Mythos"){kind=icon}
 "Steampunk Tower"){kind=icon}
 "Samsara Room"){kind=icon}
 "Jelly Escape"){kind=icon}
 "Incursion 2: The Artifact"){kind=icon}
 "Epic War Saga"){kind=icon}
 "Lucky Tower 2"){kind=icon}
 "Cat God vs Sun King 2"){kind=icon}
 "Bloons TD 5"){kind=icon}
 "Penguin Overlords"){kind=icon}
 "Meat Boy"){kind=icon}