Not exactly the same premise that you described, but just a first reaction on the title is try Final Fantasy X. It’s certainly got time travel elements as well as amnesia!

Ya this is unfortunate but typical of so many kickstarter games. Back around 2011-2012 when kickstarter games were really taking off I backed quite a few. I think I’ve been able to play 2 maybe 3 tops. Lesson learned: it’s just very easy to underestimate time to deliver on lofty promises. Ideas are cheap; execution is what’s insane. Many of these were individuals or tiny groups with little or no real world experience in industry so no experience with project management; it’s really no wonder.