Really?, Three different attacks with a grenade launcher and only one attack does multiple enemy damage and with 6 grenades. Last time I checked, it was close enough for horse shoes and hand grenades. It would seem any attack with grenade launcher would be multi enemy attack.
This is fantastic. To draw more people, have you considered making game options. Like, falling kana with the options on the bottom that you can click on. With each level getting faster. Then add some badges and achievements. Then you may get some more attention to this a a game.