The Sirena Expedition has a confirmed release date! It will be coming out on the 26th of October, to coincide with this year's Steam Halloween event, Steam Scream: The Revenge. It will also be discounted for the duration of the event, from £4.99 (or $5.99) down to £3.99 (or $4.79), so get in there early.
I'm really excited for you all to play the game!