It's a little unclear in the update I've realised, but yes! The early access discount will be applicable for both Itch.io and Steam. Chapter 2 should come out at the same time on both platforms unless Steam is really weird about us, so you shouldn't have any problems getting the game on the platform you prefer. We're also going to do our best to make sure saves from the Itch.io build are compatible with the Steam build, to make things as easy as possible.