IMDb comment says:
The special effects alone on this film will astound anyone who has seen American SF serials from the same period, such as Buck Rogers and Flash Gordon. This 1930s speculation amazes with its accuracy of prediction. Everything from the look of the rocket ships, to the weightlessness scene, weighted boots for moon walks, etc. Even most Hollywood depictions of space travel from the 1950s were not this well produced. Kosmicheskii Reis is a must-have for any serious SF collection, if you can find it! Hopefully we will see a nice box set of early Soviet SF cinema some day. This gem deserves the kind of restoration treatment that Fritz Lang’s Metropolis has received.