I think this is a great tool for text art. I have a couple of suggestions I hope you are open to.
1. Add keyboard control for the cursor position, and glyph input through keyboard. This is a very efficient way to work with text art and would widen the appeal of iisel.
2. Include a few more fonts of prepackaged with iisel. Adding a 9x16 and a drawing font would give a more versatile first impression. Some first time installers may lose interest quickly because iisel does not have more options without realizing how good iisel is.
3. Similarly, Include a couple of extra palettes. A few extra options goes a long way!
