Thanks for playing! The game doesn’t support a 2nd button, although I do have a joystick that maps a 2nd button to Up and that works. I don’t have an ArcadeR or similar to test with.
A standard c64 second fire makes you jump!
Ive solved the issue on the c64u - the USB mouse i had connected was using the extra paddle/joystick input lines - shared.
Problem solved.
I can post a video of your great game working with fire 1 for fire and fire 2 for jump if you like! Its brilliant.
Ah great to hear it was something else causing the issue!
I always appreciate a video, and I’m glad you enjoy the game! :)