Psychosis is an above average shooter. One of my favorites on the system actually, so that's saying a lot considering the platform is the #1 shooter platform, ever.
Levels 2 and 3 were flipped for the US version. They did this because the garden level (level 3 in the JP version) is easier than the "lego" level (level 2 in the JP version). At least, I assume that's why they did it. There's no other reason.