I was struggling to find the word but @KRWright nailed it on the head: uncertainty is definitely the vibe that these sorts of prefaces give off, to me at least! Yours isn't saying this but the other type I see a lot is "gee so like, I know the art starts out bad but please stick with it, it gets better later I promise!"
Like... please, don't start out by telling the reader the art is bad xD that's not good for reader retention. Art is expected to get better over time so you just gotta put your best foot forward and believe that the work can speak for itself.
Looking back at yours (since again, the above is a general commentary on a different sort of note I see a lot, but not relevant to yours
), an example here is:
You know what would be a way more fun reading experience than being told "the comic starts out in grayscale but gradually adds color until (until what?)"? Just reading the comic and watching that process unfold naturally
it sounds like a cool concept to have the comic's aesthetic change over time thematically! But it gets into "show don't tell" territory for me- I don't need (or even want) to know that up front, it'll ruin the surprise. I'm sure the first time a glimpse of color appears it'll be super fun, and then as more and more show up... awesome!
The part about mature themes warnings is good, but could probably fit in either the author's note section that appears below the episode or series description and then incorporating the actual warnings into each episode as they appear at the top (as you've stated). Further, the very first sentence is synopsis type content that should probably just be worked into the series description somehow.