I wish I could say anything more constructive than just singing your praises but I'm afraid that's all I'm gonna do. I've enjoyed the demo, which does a great job at hooking you into the story and showcasing the gameplay features. Having personality traits affect the story and how the character acts is great, I'm looking forward to multiple playthroughs already!
Nice "info-dumping" balance - learning about the world along with the MC was handled well, the only time I thought 'well this is getting a bit overwhelming' was followed by characters actually acknowledging the same thought within the story, making it very fitting rather than off-putting. It felt quite immersive, to be slightly in over your head along with the character you play. The world itself feels vivid, I like how it takes inspiration from the already 'common' fantasy tropes and turns them into its own, making the story easy to follow while still unique. Nice hint of intrigue at the end there, too!
All of the characters introduced so far have been a delight, I can't wait to interact with them more! I'm curious about Arien the most so far, the 'cold jerk' characters are usually my favorites and I like his portrayal so far. He may be rude as far as manners are considered, but that seems to stem from his pragmatism rather than anything else. quick question can i date Rheala? no? oh okay ..
I think this goes without saying, but the art is absolutely gorgeous. The art style itself, the backgrounds, the character designs?? Amazing. The animations are very smooth and a nice addition! I've stared at the MC sprite for so long you have no idea, all the outfits are great but there's something about the MC one that I just adore immensely.
Usually, I have some qualms with visual novels made with Unity, but The Radiants runs very smoothly. No inexplicable crashes, no weird lag in oddly specific moments, just a very pleasant experience overall! The only quirk I found is that skipping doesn't stop at choice screens, causing the MC sprite to, uh, 'spasm' quite a bit with the sped-up animation.
I found two issues with the text, both involving Grey in the second week. First is I think on Wednesday? Text says "I turn to see the a familiar smirking face" , using 'the' and 'a' at once. Second was at the party, "Attending to his guests, really? The way is acting, you'd think this was some fancy dinner party", I believe you're missing a pronoun?
Overall, the game seems amazing so far! Do you have any means of support set up? Patreon, ko-fi? I can't wait to follow along with the development!