Hey!
I like super-cute-kawaii-sugoi-desu!

The AA looks excessive to me, to the point where it kind of looks like banding

Remember the purpose of AA: to give the impression of a bigger color depth, where it needs to.
Right now, it's used liberally in every line, so it just gives a sense of muddiness to it.
It's usually reserved to soften edges, where there would be no space to actually redraw the line for it to be softer...
I'm no expert on AA, of course. Just my two cents.

And just so we're clear, this is an example of actual pixelart and not oekaki (right?)
Since you took care that the lines were always 1px wide and then AA'd the hell out of it
