Not bad at all!
I'm generally not one for demos, but I found this to be fairly well done! I think the best thing about it is probably how it lets you have a lot of fun with all the free space. Then again, it isn't well developed. I normally advise against submitting tests, but this wasn't that bad. I can not wait to see the full version of this and your other works. MLP is so popular on the Internet it deserves to have some great games.
I also really love the music in this. It seems pretty much perfect for what an MLPFIM game would be like. You get to see a good degree of how to get around and there's even a familiar face with Applejack here. I do not like adventures games that much, but I suspect this will become fairly popular. It already has high votes!