Sci Fi trash movies

After seeing Forbidden planet I was hungry for more good sci fi. But good sci fi films were scarce at the time. They were creeping into the theatres in Zagreb at a painfully slow pace for my taste. So, I went to see whatever was showing.
Among the trashy stuff a couple of films stood out because of design and the special effects, which were rather good:
"First Spaceship on Venus" (German: "Der schweigende Stern") was an East German/Polish science fiction film directed by Kurt Maetzig in 1960 and loosely based on the "The Astronauts" by Stanislaw Lem. Supposedly Stanislaw hated the movie.
Japanese "The Mysterians" from 1957 had an interesting giant destroyer robot and some space crafts designed after the rocket ships from Dan Dare comic.

Is it me or the famous R2D2 looks a bit like the robot from "First spaceship on Venus"?

"First Spaceship on Venus" (German: "Der schweigende Stern", Polish: "Milcząca Gwiazda") is a 1960 East German/Polish science fiction film directed by Kurt Maetzig and based on the "The Astronauts" by Stanisła
Read more at http://stuffpoint.com/science-fiction/image/421044/first-spaceship-on-venus-poster-wallpaper/#dm02g7gY0uT7SgyY.99