Matt Hurt’s review published on Letterboxd:
Solid Russian creature feature. The plot reveals itself well with a few surprises along the way that keeps the momentum up throughout the film. As we learn more about the motivations of those in charge at the institute, the film becomes more bleak and the stakes rise accordingly. Akinshina’s performance gives Sputnik a worthy character to rally behind as Tatyana struggles to do what’s right or even recognize what is right and wrong in an increasingly volatile situation.
The character beats are fleshed out well in contrast to the violence and morally questionable (and in some cases, repugnant) behavior of the people in charge. There is a healthy amount of violence and tension.