When you first meet Zia she is playing the song "Build That Wall" which describes how the Ura, the native people of the world that bastion takes place in, are going to dig their holes and wait until they can destroy Caelondia, and that any attempts by Caelondia such as building walls are futile. Here's the lyrics if you want to read them. Zia is shown to be an ally throughout the game so I definitely think the developers want you to sympathize with the message. Zulf, the other Ura character is intially shown to be two-faced, inviting himself to the Bastion only to destroy it, but I think he's pretty justified since the Bastion could be another superweapon designed to destroy the Ura just like the last machine the Caelondians built. Even though Zulf is initially portrayed as a villain, I think its pretty clear that he actions are because of his justified hatred of Caelondians considering the whole attempted genocide. If you choose to spare Zulf, the Ura stop fighting you and the song Mother, I’m Here plays which is a really emotional song about Zulf's acceptance of death that helps humanize him. Rucks/the narrator is an fairly evil character despite the fact that he seems so friendly on the surface. He's defintly using The Kid to rebuild the bastion for him and purposefully obfuscates the Bastion's true purpose. He's also distrustful if not outright racist towards the Ura which is why it can somewhat hard to see the positive aspects of the Ura since Rucks is one of your only sources of information about the world. His desire to use the Bastion to travel back in time is a pretty reactionary view, It could be that he doesn't believe that Caelondians could have caused the world to end and he just wants to go back to the way things used to be. The obvious flaw with this plan is that once this time travel has happened, no one remembers anything that happened and thus can't even try to prevent it from happening which eventually leads to the exact same events happening again. Rucks is most likely aware of this and just doesn't care, he just can't stand living in a reality where his pro-imperialist views have been so thoroughly destroyed. In conclusion, he is quite literally an unreliable narrator. Everything I'm saying about Rucks I'm assuming is at least partially intended by the devs. He's supposed to be a conservative that wants to literally return to an imagined better past. The final choice of either traveling back in time or flying away is an interesting choice because a character you just spent the whole game and trust deeply at this point is trying to convince you to make the wrong decision. The traveling back in time ending is not portrayed as a good ending for all the reasons I described, It's designed to be an awful ending for the game and that's completely normal.

To more directly answer your question, Rucks is definitely a pretty shitty person and leads the player to some pretty awful conclusions about the world through his dialogue that could be considered somewhat fascist in nature. Since he's basically 90% of the game's storytelling, it can seem like the game as a whole is leading you down some awful conclusions. However, when you go against Rucks by sparing Zulf and deciding not to go back in time, the game rewards you with much better outcomes, quite literarily rewarding you with music in the case of sparing Zulf since you don't get to hear his song if you leave him to die. In my view, the devlopers intended for you to have a strong bond with Rucks since you spend so much time with him only to have this relationship deeply questioned near the end of the game by having him advocate for terrible decisions.

To briefly tackle your question from another angle, from interviews/their other games I don't think anyone at Supergiant is right-wing in any way. They don't explicitly put politics into their games and there has never been any sort of controversy involving their politics from what I've seen.

Hopefully that wasn't too wordy and I got my general point across. I'm not trying to dunk on you at all by making this post. I've been wanting to talk about the story of Bastion for a while and this seemed like a good opportunity to do so. This is all just my interpretation of the story and you're free to disagree with me on any of my points.