The price tag is definitely a bit unusual, though I suppose what they've billed as Early Access would in this specific case of the way they've done it more traditionally count as something of a "Late Beta" instead of an early alpha. IIRC, albeit vaguely, Kickstarter backers got in at a much lower rate---not unlikely that this phase of pricing is to tip the hat towards the risk they took all those months ago as that's something of a trend in the KS to Steam life cycle of late.
An unorthodox situation, but that's how it goes with the advent of KS mixing things up that allows for crazy projects like these to at least have a shot at running their race that they'd have likely not had otherwise.