Sure! What I was talking about is about the velocity, when I press A on keyboard it first slowly moved towards left and then all sudden after 1 second of pressing A it fastly shifts towards left which should not happen, let's say use a "movespeed" variable and a "time.detlaTime" to let the ball moves left at the same const speed(for now your horizontal axis is not synced with the game so use above variable and method).
And lastly if possible please play my game and rate it as you like.