I've read a couple of your chapters now so here's some input:
Thumbnail: I know your art style is changing and I checked out your latest episode too, but I will say it feels like your thumbnail doesn't quite reflect exactly how good looking your art is! So definitely try and look into if you can make a new one (if you want to) that shows off your art style!
Description: Your description is alright but the language can feel a bit overexplaining at some places. Try and see if you can revise it into something more precise and to the point. (if you need help you're free to PM me and I can try and help you out a bit! I'm no expert but more people's input always helps 
)
Chapters: As for the chapters themselves I think you should use speech bubbles for when the characters talk and then the "subtitle" looking text for when they're thinking. It quickly becomes a bit too confusing when you have the thinking and talking in the same format but then sometimes have speech bubbles. It'll be easier for your readers to understand when there's talking if you use speech bubbles 
Also watch out for spelling errors or random capitalization of words, I've seen it a couple of times in your panels, where you have capetalized the start of a word for no reason.
Spacing out your panels can also help with reading and not making everything feel very closed up especially for scroll format. It's a bit too tight fitting fx in episode 6 The Challenger.
Prologue/intro: Your intro is very cool and I really like it! However I do think you could remove the last two pages where you see the main character. Since you repeat these in the next chapter anyways, I think it'll be more impactful if you end the intro chapter with the page that says "can you hear us calling out to you?". (that part gave me chills 
)
Also consider renaming your first chapter to only "Lost in the crowd" instead of "Teaser- lost in the crowd" since it feels like that chapter isn't really a part of the story then. Teasers should be before you've started the story after all and that's not the case anymore 
Other than that your art is really well done and you seem to be growing at a pretty good rate so just keep up the good work! It's an interesting story premise too and your character designs are very good looking! (and good job on the different expressions!)
Good luck with your comic, I hope i could help a bit :,)
