The latest Lux Delux beta build has support for more Steam achievements, calling out some of the deeper features of the game (we have even more coming from up our sleeves still). Also we're coming online with leaderboards that sync up to the Lux online rankings.
Anyone that has bought Lux direct from us in the past can join the final beta week by using the registration key retrieval tool.
We are looking forward to releasing publicly onto Steam on Friday! We've scheduled a series of Mayday Tournaments to welcome steamy new Luxers.
:)