There’s no harm in saying “u” instead of “you” as long as you know which one is grammatically correct, and the readers know what you mean. And this is a comic website so you don’t have to be professional if you don’t want to.
I have recently read all of endtown up until this point, and I just want to say how much I love it, and I appreciate how much effort has gone into it. Get well soon Aaron!
Rat isn’t shaded in the last panel