The developer's a lying sack of ♥♥♥♥, which I suppose has never been entirely uncommon in the game industry. Unfortunately, it's not like the days of old where a game like Big Rigs would simply cause an entire company to go under, and hopefully many of those people went on to work on real games, or committed suicide.
No, this is the glorious age of crowdfunding, where ♥♥♥♥nuggets like the guy who made this game can tell you that a feature will be included, then not only fail to do so, but obtain enough support to create a second version of the game. Not even a sequel. A second version of the game that will be sold at full retail price.
So what happens if you own this version of the game? You get like, a 20% discount on the new one. That way, if you're actually ♥♥♥♥♥♥♥♥ enough to buy it, you can have two different versions of the same game in your Steam library: one unfinished, the other with the promised features for the first(maybe; I wouldn't hold my breath). It's like if every patch for every game were released as a separate version of a game and you had to pay for all of them.
There isn't even an entire company behind this game. It's just like one dude. Jesus. Let it go under so he'll go back to accounting or whatever the ♥♥♥♥ he did before he became a professional thief.