As first :) sorry for my bad English and i hope you understand what i want to say.
May be good idea offline play button in spiral knights?
Because lots of time some people have a trouble play spiral knights without lags and they die in a room for example "Fire Storm Citadel" because at your PC is your spiral knights character in wrong location... for example : You at your PC go next to "Red fire" but you are hit by this Red fire and you do not know how... and reason : you was a bid in "Red fire" way but you did not know that because you see at your PC something else.
you need a connection to load all the levels in the game. the lag is caused by the connection, not directly by other players. sorry D: