The main character is fun, interesting, and, more importantly for me, likable. Supporting characters are solid ( although his brother clearly has some explaining to do). I give the character score a 5.
It's still too early to judge the story, but the plot, which revolves around the main character obtaining a strange mask, can be predictable. It'll be interesting to see if the author can keep the concept fresh and surprise us along the way.
Grammar appears fine. But I'm no editor, by any means, so don't take my word for it.
My only complaint is the length of the paragraphs. I would divide them in half or thirds to avoid the chapter looking too wall-of-text-ish. But that's just my personal preference.