Finished with Kasane, which means I've finished with both characters. Overall thoughts -
Positives:
-The combat is great, and the SAS system was done well. Combat itself is never really unfun or a chore.
-Pretty good graphics and voice acting
-Decent reply value on the 2nd playthrough, for the first 2/3rds of the game the story is pretty different for each character
Negatives:
-The story/characters are mid if we're being honest. Kasane is aight, Yuito is pretty much a generic RPG protagonist and most other characters are just anime stereotypes. The story itself was somehow both weird and still not that memorable, there was a bunch of questionable time travel mechanics. The villains were also meh. Karen''s entire motivation for changing the timeline was that somebody died and he can't accept it? Weak. Also, this game has about three years worth of cheesy friendship speeches, I mean c'mon now.
-The enemies were lacking in variety. Once you hit the 2nd half of the game it feels like you're fighting the same enemies over and over, just more of them and/or with more HP. Gets repetitive, especially on the 2nd run.
-They don't give you a lot of reason to care about side missions, at least from what I saw. The few I did, I didn't really get anythingi worthwhile and they had nothing much to do with the story.
Overall I'll give it 8/10
If there's a sequel, the main focus needs to be on writing a better story and having more different enemy types.