It seems that I have all of the battle mechanics firmly in place now. At this point I'll mostly be testing. The testing won't be for polish yet, it is to catch bugs, make sure everything is working smoothly, to see what kinds of design decisions I can change, how much can I reasonably add, what should I remove, etc etc. Other than testing the only thing I think I really, really absolutely NEED to do is to add more sound effects and hopefully expand on the music.
The second most important thing I think I need to do at this point is make sure the game is as accessible as it can be and that it's not too much of a puzzle for normal game mechanics to be figured out and utilized. How and when to explain certain parts of the game and if those parts really need explanation, etc.