There are definitely pieces of art that I'm not satisfied with and plan to clean up as I go along. I'll be doing that gradually, so that I can balance the effort that requires with the time I spend on new writing and programming. I'm definitely keeping in mind what I can do to make sure I don't make redoing art even more work than it needs to be.
One thing that's not likely to change is the basic style of the art; it's always going to be simple and cartoony, but hopefully it'll be less distracting for some players as my skills improve.