I don't know what this game is, but the more Japan-only games that are translated into English, the better.
One think I'd like to point out, tho, is the awkward grammar in the screenshot. It should say...
"You did well to get this far as just a City Sweeper," (mainly, no comma after "far")
"but now I am preparing to use my nuclear bomb."
Or if you want to make the two separate, then a "However," would probably work better than "But".