Drag the cat and press space to place keyframes. Arrow keys to move the timeline bar. You can also drag it. Press p to play your animation.
I was messing around with Blender one day and thought, "What if I made a keyframe-based animation project on Scratch?" I wrote the scripts, the Scratch team did the cat artwork. Note: At the end of your animation, place another keyframe a couple frames after the end. It will glitch out if you don't.
