I thoroughly enjoyed this. It's the first thing I've watched recently that didn't feel like they could (and should) shave an hour off of it. A nice, light watch that had a unique concept and a likable cast. I agree with others that the eye popping scene was about as intense as it got, with everyone else dying in fairly lackluster ways. I'm not normally one to say up the gore, but a bit more would have made the second half feel more intense and urgent.
I also couldn't help but find it amusingly relevant to the current world "situation" with Siobhán urging everyone to quarantine themselves and think about the greater good over themselves. If she only knew what an impossible task that is.