Thoughts on Hamlet (In Progress)

After watching the video of Act 1 scene I and reading it as a class, my first interpretation was that this was going to be a creepy and dark horror story of some sort. However, it as not as melancholy as I first thought, it isn't a happy cheerful story. It is sprinkled with sadness, murder and revenge. In Act 1, you are introduced to Hamlet while he is mourning over the loss of his father and the fact that his mother just married his father's brother. But, by Act 3, he is completely different character plotting revenge for his father's death against his uncle. The last noticeable difference I picked up on was his careful planning of plotting how he would kill his uncle. By preparing a play in act 2 and choosing not to kill his uncle in the middle of prayer, to how quickly he reacted when he assumed that it was Claudius behind the curtain and took a sword to Polonius.