I hate that I sorta hate twin-stick shooter Windowkill
Windowkill is the most inventive arcade shooter I've played for years.
It's twin-stick shooting in a tiny window that temporarily expands in that direction when you shoot its edges. You have to actively manage and maintain the play space itself for that to even be an option. Soon static monsters appear in their own isolated windows you'll have to shoot your way towards (their attacks can cross the void between), and before long there are the horrible hateful little blue bastards who sit there passively, soaking up shots and never attacking but actively pulling the edges of the window towards them.
It's a clever and great little thing and I sort of hate it as much as I like it.