Ngl I know shit-all about Mr. Puzzles other than what design elements he shares with RGB. It's never really bothered me until now, cus I feel he has enough differences that you can tell them apart. He's on thin ice...
Tho I just saw that Mr. Puzzles also does the drippy screen colour thing (I could be wrong. I'm literally going off of a youtube thumbnail) and for some reason that bothers me the most.
It's been such a specific and distinct RGB feature that I haven't seen anywhere else other than like, I dono, the general dripping tv static here and there (I have no examples but it is something I've seen in media through the years). It's such an RGB thing because it has meaning; he's not just dripping random colours for the sake of it.
Not sure if that's the case for Mr. Puzzle but ye. Anyway, go show some love to ModMad and their comic The Property of Hate. It's fantastic and the art is beautiful. Been in the works for over 14 years now.
Even if I'm not drawing fanart for it, it is a series that has stuck with me and I pull inspiration from every time I draw. Every update we get is a treat.