Neat. Have you thought of requiring the user to finish the level once (and maybe store the "example solution" with the level file data, which might be useful for a future "show me the solution" feature in the game) so that all user-created levels are guaranteed to be solvable?
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Thanks! Yeah, it's something I've thought about a little. Not sure if I'm going to formalise it as such though. It'd be useful if the number of moves was measured (compared to a Par) and scored, which it isn't. I'd much rather give a hint in the level text popup or the title. I don't expect there to be a massive community around it, perhaps just a small group of people making and distributing something.