Left and right arrow keys to walk, up arrow or space to jump. Not a complete game by any stretch of the imagination. Just want to make something fairly smooth and simple that someone can easily modify.
Huge props to @Ctave9 for his scrolling platformer (https://scratch.mit.edu/projects/349016248/) particularly the collision detection section. I added to it a little so now the cat slides down the ramp if it is too steep. I'm using a "box collider" type of costume to see if the player is touching black (the level) and then adjust his location and switch back to the regular cat costume which is slightly larger. This way the player doesn't appear to float above the platforms. In fact, the sprite can even overlap the platforms a little. =)
