I wasn't sure if this was an intended feature, however I accidently held Space Bar for a split second and it ended two turns instantly. Holding down Space causes the game to end hundreds of turns without any feedback provided to the player, although your Gold Counter goes through the roof!
Needless to say, I think this should be changed - the behaviour should be that holding down Space doesnt end multiple turns, only one turn, with each turn requiring a seperate press of the Space Bar to end.