Basically every player is aware of Spiral Knight's backgroud story. Your ship the Skylark crashed and you've taken refuge in Haven. but nobody knows what the ship looks like. So i thought this over and i think it may be a pretty cool idea. There are 3 areas of haven. Bazaar, Town square and the arcade, but what if they were too add a fourth area? from the Haven spawn area there is a path on the right of the fountain that is blocked off by a colom of some sort. Maybe an interesting thing to do would be to add another little area there with maybe a special merhcant of some sort, but there could also be another path to the far right, leading you to an area in ways similar to a guild hall, small and simple. but instead of a view of gears and pipes. from there you could see the crashsite of the Skylark. Or maybe something along those lines. i thought about it and i think i'd be a pretty cool thing to add to Haven, so it doesnt feel so small.
Id rather see a new t2 or t3 areas with new boss or even a t4 side path whitch will lead you trought a deepths were you can find parts of Skylark wreckage and at the end you fight some kind of boss, creature that made his lair deep in the Skylark wreckage.