This game has some very weird and possible broken controls, so I decided to try to explain them as best as I can. Walking seems to work regularly, you start with no speed and accelerate up to a certain point. It's jumping that's somewhat broken. From what I've gathered, you cannot change your speed or direction midair. When you land, your speed decreases depending on how much you moved up. The higher the platform you land on, the less speed you lose. I hope this was helpful, as the first time I played this I had no clue how the physics of this game worked.