I would genuinely continue pledging for early access, if the updates were frequent and the dev was sincere. I just canceled my subscription the other day.
People still fall for the "its just one guy" excuse. He has a manger, he has a team, he is holding a fan meeting to sell merchandise.
I have been a developer for over 10 years and I can confidently tell you this project is not that complex. To be fair, i am not sure how much project management experience he has nor how fluent he is at code. The only things I imagine might take time are the beatmap, art and music but, as I understand it, he already completed most of that.
Side note, I really like the UX, I think it's very clean.