Having watched it last year, I don't particularly remember the first season - I recall it seeming a bit slow and uneven, with an initially-odd-but-grows-on-you animation style. However, there was something interesting about it and it progressed nicely, building out the world, characters and general plot/story.
The second season is a more "complete" season. It didn't progress the story a whole lot, but was a very enjoyable character-building season; it felt very much like a Netflix-style show (although they apparently only commissioned the localization), where they took their time to tell the stories they want to tell and everything flowing together well; granted, that's typical for good anime and its serialized storytelling.
One of my big gripes with the second season (besides the lack of major storyline progression) is that while watching the fleshing out of the characters and growing relationships, I noticed a strange dichotomy on how the show is strangely both misogynist and feminist. The show has a LOT of fleshed out female characters, but a strong portion of them fall into the trope of falling for the male lead. In this case, the male lead is an amazing mech fighter, but awkward human. Granted, there's lots of awkwardness abound, which does help play with the ideas of the characters being slightly a-human due to their situation, but it lessens the show to a degree (must EVERY lead female develop feelings for the sensitive lead male?). It feels quintessentially Japanese, in both good ways and less so.
That said, it does a very interesting job of showing people falling for someone who clearly is not paying attention/still not over their ex. I found that take on the story to be more interesting than the repeated awkward romance attempts and lesser plotlines.
Recommended as a casual viewing for people looking for an interesting space-faring mech action romance sci-fi show that could only come from Japan and is easy to consume. Just brace yourself if you're expecting greatness (or closure, as at least a third season is necessary, which I welcome).
