Salutations!
Being a person who has done some reworking, I can tell you from experience that it's a lot of work! Now, I'll say this: I didn't rework my entire comic. In fact, I only reworked a hand full of the first pages because, like you said, first impressions are important. So, I remade a few of the opening pages and explained in the description that I'd edited them and linked back to their originals. That way, I wasn't abandoning my original work and, when the style changed back to what it was, people weren't confused.
The reason I linked back to my original artwork is so people could see my progress as well. The thing is, progress is part of what builds the voice of your webcomic. Your watchers are along with you on your journey and as someone who reads webcomics, I love watching an artist progress and hone their skills. I feel proud of them for all their hard work and appreciate what they have to do to share their story with me. Never underestimate the power of your progress and the connection it can help form with readers. If you ever rework pages, just let people know you're doing it and the good thing is you don't have to change everything. Lots of webomic artists do this too, so you're not alone if you want to make changes here and there.
Your artwork reminds me a little of Steven Universe. It's got a fluid cartoon style and your characters are very expressive with their eyes, which is a good thing! Wanna know what else? Steven Universe now versus when they started making the cartoon is way more fluid in terms of style and it's style has changed a lot since they started. We got to watch the progress of the characters and the artists as they honed their craft. It adds to the adventure, so even if you cringe at your old work, don't forget how important it was to getting you where you are now.
All of that aside, on to some constructive criticism for you! (As per what you asked originally, lol)
Like I said before, I like your artwork and your dialogue suits your tone and doesn't feel awkward so, kudos on dialogue! The only thing I can really suggest is more in terms of artwork. You've got a good color scheme going and I like how you've been able to make your foreground characters pop. The only thing I notice is that proportions are fluid. Some scenes Josie will be tall and have longer legs to suit her longer proportions where other times, her legs will be shorter and her arms longer. In some scenes her head is very large and in others it's proportionate to her shoulders. This isn't unique to just the Josie character, either. Xenor also has fluid proportions. Now, when you pop back and forth between Chibi and the normal character design, it's expected that in Chibi form the proportions get shortened and more impish so, there's nothing wrong with that.
I would just be mindful of head size in relation to the body and here are some models to show how measuring that work. (Cartoon, More Realistic) I hope these are helpful to you, it never hurts to have a guide nearby. (I can neither confirm nor deny having several sitting on a shelf next to my head right now. ;>.> ) You've still got an interesting story here and your work is very crisp, you don't have too much or too little going on and I think that, since you're always going to be progressing anyway, that it's going to do just fine.
Don't worry about having to go back and change pages before adding new content. I'd let that simmer for a bit as you continue forward and if you still want to change anything in the beginning, maybe redraw a page here and there, you can certainly do so! I wish you all the best and hope that the links I gave you can be useful to you as you go along. Cheers! 