Early Access is a tricky thing, there have been times when it has done a ton of good and bad.
In the case of this game, my biggest issue would have to be communication. either Valve or SuperCrit need to say something in to regards to what happened.
Communication is one of the biggest problems in the games industry, if you all haven't noticed yet
I myself have Early Accessed my way into games like Elite Dangerous, Planetary Annihilation, and Space Engineers. and while those games are coming along quite nicely I can't honestly say any of them are any safer then Stomping Grounds, I don't have that knowledge and I invested my money into them. I have made purchases I quite regret, bad investments happen guys, it's a part of our society.
It might be more complicated then just them taking the money and running, as I imagine Valve would have reacted a little more if that was the case, as they have in the past.