Mouse aiming provides 360° degree movement, in my opinion to a greater extent than controllers. I've spent my whole life with Keyboard and Mouse, so my hands feel really weird when holding a controller. It also just feels like it adds an extra layer between me and the game. But yeah, I definitely do need to get a controller, not just for twin-stick shooters, but also for DmC 3 and Co-Op in Pungeon and Wizard of Legend.