Sorry for the narrow requirements of entry. I've had a few hiccups before with keys obtained from Humble, so this one is for the UK only.
Originally pre-purchased this via kickstarter, and it took forever to come out. Went through a number of changes, but the end result is pretty good.

Sure it has its flaws, but if you can work with it, it's a pretty interesting spook-em-up.
Good luck!