Let's talk about what we'd like to see in the form of pre-order bonuses. These would need to be offered for free to Kickstarter participants who donated $50.00 or more, since they are receiving the game for free. The reason I'm suggesting them, when there was already a kickstarter, is to entice the people who didn't get in on the KS.
In addition, I would suggest selling additional "head start bonuses," similar to what was offered on the Kick-starter, on the website until the game launches (or perhaps until it goes Gold; whatever). Why limit the donation time to the KS window?