> Since the movement speed is tied to requestAnimationFrame, the speed of the game changes with the update frequency of the user's monitor. Since all my monitors are at 144Hz this game is ridiculously fast for me.

Damn. I just checked this and you're right: https://developer.mozilla.org/en-US/docs/Web/API/window/requ.... Learned something there so thanks for pointing this out.

I'd always believed that callbacks were locked at 60 fps, although I'm not sure why. Clearly this means all my own games will run at the wrong speed on machines with a higher refresh rate, and will probably appear jerky on displays with a lower rate (assuming such still exist).