@cmertb Personally, I disagree with KLSymph. I like the brackets, especially for RPG related content. It very much feels like the bracketed words are "highlight, special term here" rather than anything else. I don't like when games or articles highlight them different colors, especially articles when you can't click on them. The change is color is glaring and feels out of place imo, the same as would bold or italic if it's done this frequently for singular words or phrases in sentences.
Whether or not these brackets follow standard English...punctuation?...matters little to me as I view the text in the manga to just as much represent the story as it does represent the game like world the characters are in. Furthermore, I don't feel these brackets create any confusion as to their use or the words they are applied to because they aren't in standard English use. If a reader is not used to seeing them, they can quickly deduce their meaning in this manga. Quotation marks often have specific uses in English that would not fit how they are being used here and would 100% erase the RPG element of highlighting these words. Bold and italic have their own connotations, especially bold as it often shouts at the reader as it pops off the page.
@KLSymph I'll defer to your knowledge on how Japanese write novels and their use of brackets as I have little experience reading LN, especially in Japanese. That being said, I'd argue that is even more of a reason to keep these brackets as they are now. They provide a more Japanese/LN feel to this manga that other media do not normally have. For readers such as myself, it is quite enjoyable for various media to have their own feel to them. It grants them a unique feeling in comparison to the others and that uniqueness becomes directly associated to that media.
