(Use the “Full screen” button on the video player to make it bigger)
The trick to playing measures 17-23 is to play the same thing over and over and just keep moving one to the left. Another tip, for measures 53-60, the right hand and left hand play the exact same thing, just an octave apart.
If you don’t have a full 88-key keyboard, here’s how to play the section starting at measure 63. Move the entire left hand part up one octave. And for the right hand part, instead of playing two notes at a time, just play the top notes of the right hand and ignore the bottom notes. Everyone should be able to play measure 71-78 as written.