It can't be ruled out entirely but there are other works that contain some of those basic ideas. Lucas says that a lot of his ideas about the Force come from a book called Tales of Power by Carlos Castaneda published in 1974 the same year Lucas wrote the rough draft of Star Wars. Castaneda claims to have been trained by a Yaqui sorcerer. Among the sorcerer's many teachings is the idea that we are all "luminous beings". Those words are put into Yoda's mouth in The Empire Strikes Back.
Darth Vader, being a masked villain, is in line with a trope common to the 1930s serials Lucas was inspired by. The plots of a lot of them concerned the hero's attempts to learn the true identity of the bad guy causing all the problems. One these serials The Fighting Devil Dogs has a masked villain called The Lightning that the book The Secret History of Star Wars asserts was an inspiration for the development of Vader.
Ralph McQuarrie says that he got the idea for the mask because he thought Vader would need it to breathe in space as they are boarding the ship. McQuarrie also said that Lucas told him to add a samurai helmet. So while it's possible The New Gods was consulted as well it appears the similarities may be the result of parallel thinking.
As for the father twist, there's prior art for that as well including the aforementioned The Lightning. He is revealed to be the father of the lone female character. There is another movie from 1932 called Tombstone Canyon that has the most dead on similarities.
The hero comes to town because an old man has written him telling him he has information on who his parents were. In the meanwhile a mystery villain known as The Phantom Killer is causing trouble for a local rancher and his gang. The old man, described as a "queer old fella" (vs "strange old hermit") is killed before he can tell the hero what he knows. At the end the hero and The Phantom Killer learn that they are father and son. The father is fatally wounded saving his son's life and the last thing he wants to do before he goes is to look at his son.
A film critic named Michael H. Price claims that it was on the basis of this movie that he knew the father twist was coming well before the credits rolled on his first viewing of Star Wars in 1977. So again while Kirby's influence can't be ruled out here there's other precedents that Lucas could have pulled from.