Hey, this is really terrific! Extremely impressive, especially the fact it's so small (code size). This expresses a real retro sensibility that most "retro" style games miss: pixel art shouldn't take up megabytes of space.
I think you should do something with this. You've actually got something you could spread far and wide, in this. It's shocking how few Web-based MMO experiences there are like this. This is the point where I say "quit your day job." Unless this is your day job.
To whit: such a small MMO could become a nice little business for you. People will pay for cosmetic stuff, and they love to idle in virtual worlds...