Not so much a game as a tribute to the fishing minigame in Deadly Premonition. I mean, technically you could try to go for a high score, but you probably won't want to.
Fire 1/Z to cast your fishing rod and stop the roulette once you catch something.
As of Pico-8 0.1.0, the intro screen is subject to this bug. If you're running the cartridge in the native version of Pico-8, pressing Esc while the logo is scrolling off the screen will crash the entire program.