Starting right now, those who met the requirements through Kickstarter should have received an email to begin playing the beta for Mighty No. 9 right now. Yes, right now backers from Kickstarter for the game can be playing it through Steam.

They go on to say that there will be no other beta coming for other platforms. In addition, if you weren't a Kickstarter backer and didn't get in via PAX invite, you may be able to join the beta in the coming weeks through Steam. Nothing is set in stone just yet as far as a more open beta or "Early Access" program.