I downloaded the game from steam recently, using my main steam account. The issue is that I don't want to rack up time in Spiral Knights on that steam account, and would much rather play on an alt. However, I can't find any way to log into my Spiral Knights character using my alt steam account. Is there a way to do this?
You have to login to the Steam client using the Alt account (Steam window, Top menu "Steam", Change user, login info, [profit?]).
Also, each Steam account generates a different SK account used for login. So you can't use UserA, to play on UserB.... thats just basic account security on Steam.