I have a few of the Cotton series. Definitely fun and funny games. I never really considered them the best shooters, but they were unique.
I also do have Rainbow Cotton and while the autoresetting controls take a little bit to get used to, I did it. Not to mention, Rainbow Cotton has some of the most unusual and unforgettable bosses. I'll never forget the *disturbed* fairy I had to fight. And what a fight it was.
What makes it so disturbing is that this fairy is going around singing all happily, and bopping around with her love, love, happy, happy ways. Bringing flowers and all. Yeah, that sounds stereo-typical fairy like, right? Wrong, because while she's doing this, she uses this to conjure up all kinds of military ordinance to DESTROY YOU. It's just then, when you find out WHY this is happening. You see, she's a fairy and yes she's sadistical and wants to kill you, BUT the ONLY way she can make her attacks are in delightful fairy ways. She has to LA, LA, LA, and do Happy things in order to do any magic. Even ones meant to harm. That just struck me speechless, when I saw that.
Also, another cool aspect in Rainbow Cotton (as you progress, in the game) is what happens as you get more fairies to fly around you. They actually converse with each other, and the more fairies you get, the more dialogue you hear go between them. Eventually, you'll be flying with a bunch of them and you'll be treated to various fairy conversations as everything else is going on. A pretty interesting touch, I'll say the least.
I have Cotton also for the NGPC. It's also is the game that makes the BEST use of the NGPC rumble Pack NYKO made. It's the only time I use it, actually, but playing Cotton NGPC with rumble is a very cool experience. They coded the audio to work perfectly to activate the attachment, with the right intensity and for all the right things.