Locking previously freely available content behind a $6 paywall is abhorrent. If you didn't add enough content to the steam release to justify the price tag when it was already available for pay what you want here, then you should've either not done a paid steam release, or you should have spent more time to add stuff worthy of the price tag.
I hope you enjoy whatever additional money you get from this, because at least personally I'm refunding my steam purchase directly due to this decision