Actually the early release were only a couple of bucks when it was available here. I admit I bought it when it was only Chapters 1-2 and I only paid about $4 at the time. It could be because people who bought the game early release paid less than what the supporters on Patreon and Steam is offering. This game is pretty good so I bought it again on Steam because of the support updates and achievements, plus the Steam launcher is nice to work with. Like you said if you don't mind paying extra, just buy it again on Steam they usually have better update supports if there are bugs and quick fixes they usually get patches as soon as it's release.