This is an amazing game. As a shoot 'em up it plays perfectly, and it's binary color mode mechanic is unique. But boy is it hard. Not difficult. Like abusive. Like, my gamer self esteem can only take so much. But as I said it's executed so well there is never a moment where you feel the game is cheating you. You just aren't good enough. It didn't take long before I turned down all the difficulty settings, and I was still getting my butt handed to me.
The essence of the game is this. You know when you are playing a brain age game, and you feel like your brain is being asked to do something it's not supposed to? Like there is this empty space inside your head your grey matter is trying to fill? Combine that sensation with a really difficult bullet hell shooter. That's what it's like.
Of course when you do accomplish something it is immensely satisfying. It's just very hard fought.
This is the perfect game to have on your hard drive, so when your mind is fresh you can give it a go. Also I picked it up for 5 bucks. I highly recommend it at that price.