Okay, I went back to it to find some notes. There isn't anything obvious that needs improving, but I will break the illusion of perfection if I must. The grinding can bring the movement to a halt when using a controllers joystick. Maybe a rounding error of a previous input? Similarily, I was able to go straight down holding the ufo only when pressing down on the joystick. I couldn't find a way to do that with keyboard or the D-pad. But yeah, very minor stuff. Cheers!