Lacuna Passage will be released "when it's ready", but you can help us by pre-ordering now. Pre-ordering gives you immediate access to a small alpha demo called Lacuna Passage Prologue (15 minute scripted sequence for PC and Mac only). Soon the survival sandbox mode will be available via Steam Early Access to all pre-order purchasers. The full game, including story mode, will eventually be available for PC, Mac, and Linux.