Well, this is a free for download game. It is like those old games, such as Pilotwings and Twinbee, those good ol' top down view shooters where you control a little spaceship and enemies keep flying at you.
Lately I have been playing those a little bit, including this game.
It was originally released on some console, but was remade on the PC, which you can just download for free. The game is very crazy and you barely have time to think, cause bullets keep flying at you.
There is also a secret boss in the game, which just adds a whole new meaning to the phrase "holy #####", it is ridiculously fast with shooting his bullets and careful placement is needed to dodge his attacks and knwoledge is needed for that aswell.
It is fun, it is free, so why not check it out =).
http://www2.tky.3web.ne.jp/~yosshin/my_works/index.html