I would spill a single tear were the game any decent... though for me not having MP is actually a selling point, as games designed for MP will always be inferior in SP. Sadly this game is inferior in SP even without MP.
Anyhow.. a KS is not a list of legally binding promises. You donate money, and whether you get what's written in the blurb is completely random. You get what you pay for, and you should read the description of the pledges carefully and realize that just because something is promised in the project updates doesn't mean that it will be in the project at all. Kickstarts are donations, not purchases or pre-orders. And there is no legal way to demand anything, as you are not an investor. You
donated money.
That's not a reason to not pledge on KS, but it is something you should know before you do it
And hey, nobody with any passing coding or game developing knowledge expected this to get MP in a later patch. So my surprise is as limited as the tears I spill over this dead 4x ,)