I would love some way to upgrade our towers or unlock new ones. The realm mode is very much "we have Creeper World at home", and I do think it's fun, but it can be tedious. Maybe the monuments or new constellations could have something like that, since most of the monuments have been useless for me at the moment. I haven't converged since I unlocked the passive light harvesters, so bonuses to base light generation feel completely pointless unless it is to prepare me for another stage of the game where you suddenly need hundreds of trillions of regular light.