I just purchased this and have had a few days to play around with it. I really like it! Just a couple of notes / requests for future updates...
1) I noticed that when switching themes, something weird happens with the cursor where it can get out of alignment with where text is actually being edited. It either shifts a few spaces back or forward which makes editing a little difficult. If you keep the same theme for the document you created this doesn't seem to happen. At least this is what I have noticed so far. I am a MAC user by the way.
2) It would be great if we could control the volume of the music and sound effects separately.
3) a random idea: would be great if you could go into whatever house / hut / castle thing and have that be a "writers room" or something that you could upgrade based on your XP. Or you could implement some way to earn a currency to purchase items for your house like typewriters...writing desks...bookshelfs....that kind of thing. Quests come to mind. Like "write 800 words this week" to earn more xp and gold coins or something. Just wanted to share all these little thoughts I had while using it.
I love it so far...keep up the good work! Cheers!