About the percentages thing: one obvious problem with using percentages is that some people's Cheapo levels have more than 100 lemmings.
One of my ResEdit levels for the Mac had 120 lemmings, to save 1, and so of course this displayed as "To Save 0%"!!!
....which puzzled people who saved zero lemmings, which is also 0%, and were told they'd failed the level.
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Three more suggestions.
Firstly, I'd like it if the names of the game and editor programs weren't so similar! The number of times I've opened the wrong one........
Secondly, how about being able to nominate certain styles as "favourites"? This would make it much easier to choose a style when creating a level, as my Styles folder is jam-packed with ones I'm never going to use, but which I have to keep to play others' levels.
Thirdly, since we now have right-way-up and upside-down lemmings, why not up or down one-way wall?