Did you get alpha access as part of the kickstarter tier, or as an add-on? I suspect you're probably too late in the former case (not sure exactly how that worked) and it should have been automatic in the latter.
I'm in the $150 tier of kickstarter so I have alpha/beta access from kickstarter (not as an add-on) to which I used momentarily if you read my first post.
Is there a deadline for the former case? I did not hear swen saying a deadline for it.. Or did I interpret it wrong.