Good, but to make it great...
-Spelling. Horrors. No apostrophe
-Make an animation sequence for the opening door, ie. a movie clip. More suspense.
-Redraw the castle using a block, paste it repeatedly, then manually align it to look like a normal brick pattern.
-Center your dialogue better and use font that shows up better against the background.
Overall, this can be really cool and I'll be looking out for the next installment.