It's a Pixle Party (intentionally misspelled)! Press the spacebar to change the music. Press 1 to change the color of the cat. Press 2 to do the fisheye. Press 3 to do the reverse fisheye. Press 4 to do the whirl. Press 5 to do the reverse whirl. Press 6 to pixelate the cat. Press 7 to un-pixelate the cat. Press 8 to do the mosaic. Press 9 to do the reverse mosaic. Pressing 0 will make the cat more or less bright or faded, depending on what music is playing.
Credit to my WINGS (I forgot if it's an acronym or not) classmates for giving me the idea of Pixle Party. WINGS is a gifted school that I went to for 3 years before being homeschooled (so I could learn at my own pace, which was actually faster than even a gifted school could keep up with).