Here’s what Assayas has to say about the performance:
I grew up playing video games. Mostly on Gameboy, because we didn’t own a fancier system at the time.
I decided to cover some of my favorite tunes from the games I played as a kid, and the first one is the “Contra” theme, performed live on a Sequential Prophet XL.
I also used the Polyverse Gatekeeper plugin on the bass for the gated sound.
This game (named “Operation C”) was released in 1991 by Konami, and I played it virtually to death (literally – it was a really difficult game).