If you're looking for earlier chapters, the Palpaca tier works. It might be more expensive or cheaper depending on your location, but it's pretty much $7 or so. I'm not exactly sure, but it only gives early access to chapters before they are released and not extra scenes. (Don't take my word for it.) If you're talking about the extra NSFW scenes, I'm very sure pledging to the Coolpaca (the second tier) and higher unlocks it for you.
Are you talking about the browser version of Ascension on rinmarugames.com? If so, I'm not sure, but if you're talking about the new Ascension version on Itch that got deleted, Rin posted on her Tumblr that the game had so many bugs that she had to take it down. Besides, her artist is working on both Oathbreaker and her new game: Glam Pursuit, so it might be on a hiatus till then.
I hope this answered your questions.
