I find it hard sometimes to rate novellas since when looking at past rankings they don't compare well since it's impossible to get as invested in the characters or events in such a small space of time. I have however read a few novellas so feel I can judge it against those, I'm also a big sci-fi reader so can have some justifiable opinions in that realm as well.

For a novella it's quite good but not great, the pacing is a little mixed and in my opinion not well balanced. The first half goes very quickly but then it slows down for the rest, making it hard to empathise with the protagonist when s**t hits the fan. The premise and the world is interesting and I think a full novel set in this universe could work well. There's definitely something there from a sci-fi perspective, however the characters are way too serious. I get that the plot is serious and it's a serious situation these characters find themselves in but without some lightness or humour they feel quite one dimensional and an entire novel with them might get tiring. It's a super quick read and a good premise so it's worth a shot. I'd still read a whole novel in the same universe or by the same author but I'm not going to actively seek it out.