Use the mouse to interact with the Pikachu. Try clicking and dragging to see the reactions. Roll your cursor over to right edge to reveal options for the volume and music. A short guide to your Pikachu (spoilers!): Pikachu enjoy being stroked (click and drag) on their head or body. They do not like being poked (clicking) and will become angry. Continuing to poke your Pikachu enough will have shocking results. If left alone, they will eventually become sad. If still left alone, they will fall asleep.
Changes I made were the show variable button (hover mouse over to see) and now if you leave him alone (on ANY emotion), he will become sad. Also the timer is quicker, he has a bigger temper, and will fall asleep quicker. Also added in a song and started tweaking variables. Oh wow I, like, never do remixes. and look a glitch