Ohh! That is a bummer! I need to investigate this. 4 Bombs reffers to an illigal instruction - that should not happen.
Can you give me your system specs?
As you created a disk, I guess you are on real hardware? Standard ST? Do you have 1MB of Ram? All files copied correctly?
Maybe you can help me with a cross-check: if you have the chance, run the same files you copied to your floppy inside an emulator with the same specs as your ST... just to see if it works there or not.
Sidenote: Laserball was the first game that I created when getting back into retro gaming... it is way less sophisticated than my later games, as the core code originates in 1991. So a lot of later stuff is missing in this game.