Loved it.
The animation gave me Ghost In The Shell vibes, and the action was great.
The characters were well-rounded, flawed and interesting, and the story opens up the conundrum of the nature of time travel and whether changing the past can actually affect the future, and if not, then what's the point?
The only thing stopping me from giving it 5 stars was the numerous sequences of blatant plot armour, but you'll find that in most media. Don't let it stop you from giving this a go.
Pleasantly surprised and excited for a second season.