Yay, worldbuilding questions!
1. What is religion like in your world? Are any characters devout?
I have a whole cosmos to play with, so there'd be a ridiculous amount of religions. That said, the main one which features in Blue Star Rebellion is an Elven religion, which is tied up with the magic system. This religion holds that all things in the cosmos, including living beings, are linked together by the flow of magic, which emanates from a source called the Leyspring. Every action send ripples out through this flow of magic, called the Leystream. When one dies, their soul returns to the Leystream, and is eventually born again into a new body.
Some variants of this religion believe the cosmos itself to have a consciousness, of sorts, in that it is the sum total of all conscious beings. (An all-is-one kind of belief.) Other variants ascribe a will to the cosmos as well. (Though they don't tend to ascribe personality to it in the way Human Abrahamic religions do.) And many Elven cultures still believe in a pantheon of ancient beings called Keepers, who protect the Leyspring.
2. What kind of technology exists? Is it more in tune with our world or is it something else (i.e., steampunk)?
In areas rich in magic, a type of magic-based technology exists which runs on runeology; this takes the place of conventional chemistry and physics. In Blue Star Rebellion, this is called rune-tech.
In areas where the flow of the Leystream is thinner, civilisations rely on more conventional technology. This is called spark-tech. It tends to fritz out a lot when exposed to a lot of magic, as the presence of magic can make conventional physics break down a bit.
3. How do human characters interact with non-human characters?
It depends on the region. The Thuliv galaxy, where Blue Star Rebellion is set, is pretty notorious for a lot of things, one of them being the way the dominant species (Humans and Elves, mostly) treat other species they consider 'lesser'. Kovlins such as Glitch have a hard time, as do Fauns, Harpies, and particularly a species known as the Ahir'ri; often called 'dust bunnies'. There are/will be others, but I'm in no hurry to invent more just yet.
4. How does the economy work? Is it more capitalist, communist, or socialist?
The Thuliv galaxy is authoritarian capitalist. The government don't give a rats arse about the equitable distribution of wealth, you can do whatever you like with regards to making money - but if you're a mage, be prepared to be segregated from society, treated as a second-class citizen, forced to wear a magical siphon at all times, and worst case, get packed off to a miserable camp somewhere. And if you're poor, regardless of whether or not you're a mage, you're entirely on your own. India is a decent real-world comparison - heartbreaking poverty against the backdrop of wealth and luxury. (Slumdog Millionaire is a good movie to watch in order to get an idea of the stark wealth disparity at play.)
Most other places in the cosmos which reach space-faring status find themselves with some balance of guard-railed capitalism and socialism, to ensure a reasonably equitable distribution of wealth and a strong safety net, while still presenting entrepreneurial individuals and visionaries with the financial motivation to push technology forward. Those which don't find this balance wind up with massive wealth disparity and issues with poverty, which usually results in unrest and ultimately, over the passing of the centuries, that civilisation failing. (Or falling victim to a malignant, cosmos-devouring force known as scrios.)
The Intergalactic Federation, which most space-faring civilisations are part of, also requires member-states to have addressed issues of pronounced wealth inequality without resorting to violent authoritarianism in order to do so. This provides most space faring civilisations some motivation to reach a stable and fair economic equilibrium. For some species, this will be a type of non-violent communism; for instance, the Fauns tend to gravitate toward this, as their instincts and societies tend to be highly communitarian. Elves are diverse, though they tend to be more socialist, as they place high value on duty to society, and to the cosmos. And Humans tend to be one of the more capitalistic species, which they temper with strong safety nets to ensure everyone has a decent standard of living.
5. Does the world's history affect the story?
OH YES. Around 2000 years ago, an event called the Cataclysm - a huge burst of intense magic emanating from the Leyspring - destroyed almost all technology in the Cosmos, both rune-tech and spark-tech alike, killing trillions of people and utterly destroying countless civilisations. That said, places like Thuliv, which rely on spark-tech, were able to recover far more quickly, as the physics underpinning their technology didn't change. (Whereas for rune-tech, the magical equations underpinning their technology changes significantly.) Those in power in the Thuliv galaxy blamed magic and mages for the cataclysm, and outlawed magic entirely. Fast-forward through the centuries, and we have situation our characters find themselves in now.