I bought this game on whim. I had heard of it before but didn't know if it was any good. But, I was bored and wanted something new to play and saw that it was a shooter.
This game is simply amazing. It was one of the reasons I got an dc arcade stick (that and ikaruga). This game, and schmups in general, needs to be played with an arcade stick. It's an ethereal experience. I haven't gotten past level 2 yet and I'm playing it on the normal arcade settings (I'm guessing this is what the developers meant to played on, I'll try hard later) and I still love every minute. The use of the cannon and mosquito gun is so well implemented. I love the fact that you are literally fighting for your life in the game, hoping to charge you mosquito gun up to clear the screen. Perfect, perfect, perfect.