It's very much alive. You are looking at the meta project. If you look at the other components ( https://github.com/limetext ), there are recent commits.
People are downvoting you, but I think it's a legitimate point. For a stable project in maintenance mode, sure 28 days means very little, but for up-and-coming open-source clone of a major text editor it doesn't smell like critical mass.
That's exactly it. When someone suggests a project trying to compete and clone sublime text I expect it to be actively doing so, not doing so a month ago.