I think it's safe to say that every single episode of Final Space was better than the one that came before it. The first few episodes were a little disjointed, the characters a little lacking, and the dialogue a little stilted, but they had their moments. By the finale, the dialogue had me laughing out loud, the characters had me rooting for them, and the world-building was genuinely interesting (though never truly novel).
It wasn't afraid to pull some punches, nor hammer others home. The surprise death of Avocato hit right in the stomach and did a lot to tie everything together, and the ending is brutal.
Liberal use of sci-fi tropes felt a little stilted, again, at the beginning, but by the end I was largely on board. Rarely did these actually veer into interesting territory, with even more original episodes like the mind maze still feeling reminiscent of Rick and Morty or other series.
Most notably, though, is the similarity with Tim Buckley's Ctrl+Alt+Del; so much so that I had to double-check he hadn't been involved. Animation style is reminiscent of Buckley, character design and humour have close parallels, and even the makeup of the cast felt almost one-to-one. You have a thin, quirky, not extremely bright but honourable (in a way), immature hero; a bulky, weapons expert, handyman long-suffering sidekick; a kickass, takes-no-prisoners love interest that is ultimately won over by the innocent charms of the hero; and an annoying robot "friend" whose combination of inhumanity and desire for friendship fuels his entire arc. Yes, there are other characters, but set Ethan, Lucas, Lilah, and Zeke in space and you basically have Final Space. In fact, Buckley has been doing just that for years with the Starcaster Chronicles, which even more closely map to Final Space (though, again, thanks to the wealth of tropes this isn't too unlikely). Even the Lord Commander has elements of Ted/Scott (though I'll admit this is reaching a bit)!
Basically, Mooncake is the most original aspect throughout and not only fuels the narrative but also the heart of the story. Mooncake is a delight, hilarious, and perfectly animated.
That said... the breakneck pace and sheer amount of story fit into each episode is stunning; yes, they're long for an animated show, but I could honestly say each episode could fit a half season's worth of narrative for most shows. And, ultimately, by the end, I'm both onboard and looking forward to a season two.
Also, what is David Tennant doing here?!? I mean, he's great but I had no idea he was involved at all!