Who knows? Maybe something has happened. The places mentioned that are linked to them are also quite silent and. :/
They made Sexy Pregnant Strip Blackjack after the last update. As it goes Arkone has a lot of unfinished games, and they haven't seem upload new art on their pixiv account nearly a year ago. So it could an issues with artist. But until we get an update we'll never know. Though if we see a new game from them in next Preggo Game Jam, I'll count this game dead. Shame, I love game and loved to see what other ideas they had for this game. So I'll still keep check in hopes we'll one day see 0.5.0