Apparently, most people play the game using just the keyboard, or just a joystick in port #2 and the keyboard. Unfortunately, the game has a bug when you use two joysticks. If you have a joystick in port #1, you can’t just move the rail on the left-hand side – the rail on the right-hand side moves as well. If you push joystick #1 down, the rail on the right-hand side moves up. If you push joystick #1 to the left, the right-hand rail moves down again. That surely can’t be how it’s meant to work. Keyboard controls, on the other hand, work perfectly. I’d actually planned to build a special controller just for this game (two joysticks in one housing), but I can forget about that now, as the game isn’t really playable with two joysticks.
Translated with DeepL.com (free version)