Do people regularly see dreams of the games they play? Alas, never seems to happen to me.
What the heck is wrong with the builders of heavy cruisers if that single-man ship has as much firepower? Seems pointless to build heavy cruisers if you don't give them fitting weapons. The author really didn't bother to think things through, despite being Japanese, with the formidable modern naval history that Japan had.
Your moves don't matter one bit in space combat when using directed-energy weapons. It's not like your moves would be faster than the speed of light, or something close enough to that. But then again, I already mentioned the author didn't think things through.