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Splinter (2008) [Movie] NeoDB IMDb WikiData Douban TMDB
Splinter
director: Toby Wilkins actor: Jill Wagner / Charles Baker
other title: Espinhos
When their plans for a nature trip go awry, Polly and boyfriend Seth decide to check into a motel. On their way, they're carjacked and kidnapped by low-rent crooks Dennis and Lacey, who take the victims and their SUV to a nearby gas station. Along the way, they encounter an increasingly terrifying horde of parasites, and if any of them intend to survive, they'll have to outsmart the deadly organisms.

finished watching Splinter
Stuck in a single location with a speculative biology monster, and the characters aren't the absolute tools you expect them to be. That's enough for me, I don't need it to be as good as Carpenter's The Thing.

+1 For featuring ferrofluids as a living, spiky menace, which apparently was a thing around 2010 (Jennifer's Body and John Dies at the End come to mind)
-1 For the shaky cam, but I understand they had to hide the low budget effects somehow
= 👍