Sci-fi war between mechas and monsters (AKA the two things that look good in Netflix's 3D animation) with time travel, which is quite unique and deep, but still makes perfect sense.
The main cast is great, everyone has a unique personality and reactions to events and revelations.
Apparently a lot of people find the protagonist annoying (he is proven right after people hated him for a decade and has a big superiority complex for most of the series) but his character arc of getting humbled is done very well.
*Warnings: murder, existential dread*