Press space to make Scratch cat jump (I know it's lame, but I'm still a beginner) . Hold space and he jumps continuously.
PHYSICS! Simple but still a time killer. I made this all by myself. Sure looks like it, doesn't it? Originally, it was just the Scratch cat and the grass, but I decided to add a sky, some clouds, and a tree. Boring, but at the very least, I put some thought into it.