Where can I dl?

There are like twenty games. You can go chronologically (though you should skip the first five if you don't want to emulate a Japanese OS), or you can start with the gimmicks, or try and start at the easiest.

Touhou is not for the weak. I played the Scarlet Devil (although its full name, I'm not sure of). They are god damned intense.

Touhou games are some of those things that make my fingers vaguely hurt just from thinking about them. Shoot'em'ups are not my cup of tea.

You have to have some sort of sadistic nature to love these games. I still feel like a man despite the cast being entirely female.

I always seem to get killed by *nothing* and able to run trough bullets.

Perhaps, but it is a bit unclear to me what is possible and what is not.

there's a little dot on the character's back, usually in the middle. That's your hitbox.

You can barely see it in the bottom picture. The character is between the V-shaped bullet barrage in the bottom middle. It's a bit hidden by some of the shinier effects. Tiny circle on back = hitbox. Convenient, no?