It's funny how much stylistic intent can do for a piece of art. The Gameboy filter (I know it was created in GB Studio, but still) adds so much to the package. Had this same art been in various colors, I don't think it would feel as it does. I KNOW it wouldn't feel as does. Toss a multi-green filter over it and you're back in 1994.
The game itself isn't much, but what is here is surprisingly atmospheric and charming. Although it's not really my type of game I think this would be really cool if it were fleshed out. Imagine the places your character would have to go to deliver some mail? In the realm of video game design it could literally take them anywhere.