Obviously, I'm not a more experienced writer than yourself, so I don't want to get in the way of the feedback you're asking for. I just want to throw in a few comments though amidst the help you'll get.
As TeamContract stated above, your story is solid. I've been checking in on it infrequently over the last few months. I agree that the beginning of your first set is great. All I can really say is that some of the later chapters might need some more polish, but that's just because they are new and I know you're trying to keep up with a deadline in releases. With time those will get just as polished. You're ready for the pro-editing part, getting in touch with an editor to do a few sweeps and you're set.
I like your cover as it is, but that's just me. If you can get another cover with another artist (or the old one) to spruce that up, too. You're on your way.
Just wanted to say that it was your story (Iron Teeth) that made me want to try out the web serial format. Also the same reason I decided to give Royal Road L a shot as well, and for -trying- to get into your TOPA group. You're the Nouveau-Wildbow. You're already at the plateau that a lot of us newbs would like to get to one day.
In short, remember you're on solid ground. Don't get any cold feet or doubt yourself. Once you break into Amazon, I'm quite certain you're set. Just do what you feel you need to before you take the plunge.
Thanks for your hard work and keep it up. There are a lot of us here interested in and watching out for you and your work.