Some additional information-
Apparatus will have a full singleplayer campaign.
It will also feature a level editor for players to create there own levels (Im planning on adding Steam workshop support once I get that far)
More may be to come soon once I get there. Im really excited for the Steam part and excited to send more information soon. Expect the Steam page around end of Summer. Of course I am just one person so everything I say is not final, especially dates.
Also the games release date is not set in stone. Of course theres personal release dates but the game is ready when its ready.