Finished the game yesterday. Graphics are beautiful. The RTS-style sections grew on me after being somewhat ambivalent to them initially, probably because I didn't quite understand how to play or which strategies to use. The interface at times got a little confusing with so many enemies at the same time, especially in the final level, as at times I couldn't recognize the Kaiju creating shields for the others. In any case, it was definitely good fun.
Now on the story: it hooked me like few games have, probably because it's very good and told in an interesting manner. That I am a sucker for these kind of sci-fi only adds up. I liked how the game slowly peeled back, but at the same time gave you hints here and there so you could see it coming:
- The different years being referred to as sectors already told you that it was not time travel what was going on, besides the fact that 1945 getting destroyed had no impact on 1985. There's also the initial conversation between 2188 Keitaro Miura and Tamao Kurabe talking about recreating their old house, which in hindsight makes lots of sense (and the fact that this event comes first in the Analysis section).
- Okino's comments on 80% of the innerlocitor's computing being devoted to a process he didn't know. Also, Tamao Kurabe's body disappearing after dying in 1945
- The Kaiju not being aliens
- Kyuta Shiba not interacting with anyone
There's definitely many others, but those are the ones that stuck with me the most. That and the twist that the Kaiju were appearing because 2188 Okino reused the code from a videogame, and 2188 Shinonome decided to end humanity by activating the appearance of the monsters and forcing a restart of the loop. Even better, the solution to exit the loop found by Juro Izumi is a (wonderful and somewhat fourth-wall breaking) videogame trope: to allow you to level-up (even if that also allowed the Kaiju to do so as well). Brilliant way to give an in-story explanation to the Meta-chips.
Reading this thread has been quite helpful in clearing up some of the stuff, honestly speaking during the story I hadn't quite understood the Izumi-Morimura dynamics, and the fact that they came from two loops ago, or what part of them transferred to the next loop. Also, what I didn't quite get was what 2188 Chihiro Morimura planned all along, and why she didn't want to help them initially. Also, who was affected by the DD-426? Only Shinomone and Sekigahara? Do they actually recover for the final battle?
I would have also liked to see a bit more details on what transpired in 2187-2188. My understanding is that Chihiro Morimura recreated Kengo Ogata as an AI shortly after he died, presumably because he was some sort of mentor to her, while 2188 Renya Gouto wanted to pull the plug on her research. On Kengo's advice (because he wanted to be revived), she sold the nanomachines in the black market, but it's implied that this led to an infection that effectively wiped out humanity. This led to the 15 exiles in the satellite, and after 2188 Sekigahara murders Morimura and the bomb severely damages their living space, they end up killing each other (that part is also left without many details, perhaps understandably so). What's not quite clear is what 2188 Tetsuya Ida does to disappoint Shinonome, and I don't quite get how Project Ark survives the explosion and goes on for millions of years.