I have a minor complaint just from watching the video.
Mario sits so far forward in the camera, two-thirds of the screen are dedicated to space that is of no interest to the player as they have already passed it!
Mario should sit at the first third of the screen so that the majority of the screen space is dedicated to areas the player needs to see.
Further I think you should slow down the animated background objects and lessen their focus as currently they are somewhat distracting from the actual game elements.
(also it looks like mario and luigi forgot to shave)
Mario sits so far forward in the camera, two-thirds of the screen are dedicated to space that is of no interest to the player as they have already passed it!
Mario should sit at the first third of the screen so that the majority of the screen space is dedicated to areas the player needs to see.
Further I think you should slow down the animated background objects and lessen their focus as currently they are somewhat distracting from the actual game elements.
(also it looks like mario and luigi forgot to shave)