>>6 Don't trust torrents? Well, you just have to use common sense and utilize certain torrent sites which you know have a screening process. But whatever, have some Touhou through direct download (at the very least you can virus check them before downloading): http://vocaloidotaku.net/index.php?/topic/201-touhou-game-downloads/
Also, I don't believe that there are any true bullet-hell games that are free to play aside from a couple of flash games. Calling S4 League a bullet-hell game means that TF2 is a bullet-hell game.