Kye version 0.5.0 is now available. This version adds the animation of the diamonds, which was present in the original game, but had been absent in my version. Having the diamonds glitter makes them a more compelling goal, I think :-).
I have also continued with major work on the level editor. The menus are greatly improved now, with menu items enabled/disabled appropriately in different situations. There is now an undo feature, which is useful to know when making big edits (albeit quite crude at the moment). The editor now does basic checks on the levels when saving, which should help beginners avoid forgot-to-place-the-Kye errors.
I have also started a mailing list, to (hopefully) kick-start some discussion about good levels to play, level creation ideas, etc.