what genre does your art style belong to?
Someone once described my art style as "claymation anime" and I... really like this description. If I had to pick a pre-existing category, it's probably "cartoon", though of course cartoon can mean any number of things.
how do you pick your colors for your art style? were the bright or balanced?
Bright AF. They've dulled some in the recent chapter because of the color of the lineart + my using low-saturation greys while drawing because I can't tolerate white screens well, but they are mostly still sitting in the saturated corner lol. I do adhere to a breakdown of color theory by James Gurney (book) and Marco Bucci (youtube videos - super helpful), so I limit the palette on every page to avoid chaos. But yeah... we like to dial up the hues.
do you have to match the backgrounds with your art style? I've asked myself this question and i am still unsure about that.
I can't not do it in the same style because I suck at realistic backgrounds haha (Well, ok, I don't suck at them, but I don't find them enjoyable to draw). But there is something to be said for super cartoony characters in realistic backgrounds. I think they can be quite breath-taking. In the end it's kind of more what kind of a mood you want to inspire in your readers + what feels more natural to you.
do you use a brush to make lineart? and how did you color after making the linework?
I actually only use one brush for the majority of my art - mapping pen. I use a no pressure sensitivity pen for the panel outlines, and watercolor pen for an occasional accent. But 99% of the art is all the same basic pen. I wanted to make sure that I could stay consistent even if I had to switch operating systems or programs. For the colors, I am usually a really messy artist but in this case I opted to make my life hell during the lineart stage in exchange for easy-breezy colors. I can use a paintbucket tool for flats and some strategic lines + painbucket tool for shadows. And dat's it.
do you sometimes want to change your art style but you could not?
So... I have an art style for the comic which IS one of my styles (and I think one of my strengths). But my "normal" style - as in "please draw x for me" style - is more like this:
And there have been lots of times where I looked at really talented artists who can draw beautiful realistic renders or tons of detail and go "man I wish I could draw like that". I've been better about accepting my own strengths (motion) and weaknesses (patience) recently but, yeah... sometimes I wish I could draw like Sana Takeda instead. But I just do not have the patience or the eye for it. 
are there times where you felt your art style is out of place of the intended mood of your comic?
No, but that's because I specifically tailored the style and the writing to fit each other. In fact I actually think they match quite well, though it did take me a while to realize that I could, in fact, draw the comic however I want, instead of sticking to some preconceived ideas of styles to use for a comic.