Sorry, I stand corrected. I don’t know why I thought it was made in the 30s, Maybe because I’ve only seen the movie in b&w.
As far as I know, that film MAN FROM PLANET X is all B&W.
No color versions.
Maybe one factor that got you thinking 1930’s is this alien did not arrive in a flying saucer but a diving bell spaceship. The alien's spacesuit is also like an old diving suit.
They give a pseudo-scientific explanation for this in the movie.