Hey kids, here's my advice if you want to get all of the medals. For stage 1, use missile and only missile, for stage 2 use spread, for stage 3 use rapid, BUT, before boss, take spread again. That way the game will be easy for you. Never take homing missile, though. It sucks and it's retarded.
Of all games made by this author, this one was the hardest. There are many things with this game that probably could have been done better, but there is no point in mentioning them, because the author probably knows, and because they're not going to be fixed nor changed.
Still, figuring out the tactic was fun, and the game can be very merciless. And the idea behind the game itself is neat. There is something rewarding in beating the game, and I guess that's the extra factor that makes this game great, and the author a visionary.