Hmm... not art related and not Atari related, but I can't help but post. I would say it's definitely not cheating or not staying true to the console if the expansion hardware existed back then. NES was limited to 32KB for PRG, 8KB for CHR. (I know, I know, way more than 2600 already.) But almost every game anyone talks about does not have these limits. Even Tetris used more space! Super Mario Bros. does not, and it impresses me so much because of this.
I guess you could choose how you feel by how common the actual practice was. I feel certain hardware expansions are cheating for making NES looking mockups based on how expensive they were back then and how few games used them, but that's like 3 out of the like 20 non pirate ones I don't like.
Now for art related: I'm actually really impressed by the stuff here. Even coming from an NES programming background, I find these restrictions totally confusing but what you've got is looking really nice. That camp screen has all the information it needs, and it's readable.