I can't tell for sure, but it looks like he's using the mouse to control the ship? This is actually godawful and makes the game 10x harder than using arrow keys...
You know, for all the shit that goes on in the comments, that upsets many of the rippers, they still continue to pump out rips for us, and in these "dark" times, I think a fantastically-crafted medley is a good time to sit back and truly appreciate the work they do. Godspeed, SiIva team, and never stop the high quality.