With all the age verification laws being passed, laws the require application (including game) developers to poll operating system providers for age information, I can not afford the liability. I cannot afford such infrastructure, nor would it be justifiable for a game that isn't selling and the no one else seems to be playing any more.
Perhaps Valve will come to the rescue with an API that allows your app to piggy-back of the verification Steam will have to do, or maybe not, we won't know until they announce something. But I can't afford the risk, and this game does not have a player base or make any money to justify any risk.
Anyone who already has the game can continue to play; its DRM free, but I will no longer be selling or otherwise involved distributing it. For that matter, I currently plan to avoid developing or distributing any more games, or any other software, here or else where, commercially or free, closed or open source.
Creating this and releasing this as my vary own game was quite an experience, but all things have there ends, and so it is with this game and with my days in game development.