Nice, I'd be keen to give it a go.
Given that it appears to use custom graphics - how exactly does loading NeoLemmix levels work? Did you include the NeoLemmix graphic sets with it too? If you did - just be aware that if you're making money off this, even just through advertising (technically, even if you aren't; but it's less likely to become a problem then), you're running the risk of copyright infringement issues if you include those that come from the official Lemmings games. You're welcome to include the ones I made though (in the editor's default listing order, my ones are everything from Tree onwards).