Shooting the beam does almost as much damage the one shooting it as the one who gets hit. And that's assuming it actually hits. Also, Goku has an outrageous advantage, just because of his height, and I think his attack does more damage. As if Goku as a kid could take Superman. Some time when training in the afterlife after the first time he died, that's when Goku surpassed Superman. But Goku as a kid? A more equal fight there might be kid Goku vs. Ranma. Well, maybe it's not really Superman. Kind of looks like Megaman just dressed up as Superman what with those giant Stinkoman style shiny robot boots. Megaman in Superman cosplay. Seems possible, since apparently he can't frigging FLY like he ought to be able to!
Bottom line, the program works, seems to be without bugs per se, but the game has zero utility.