How 'bout that? I know a regular or even a gaming mouse most likely won't do the job, a gfx tablet however could be the perfect tool.

Seems like an interesting control input! Maybe I'll consider trying it out after fleshing out the menu/settings system.

The first time I've seen a bullet hell in a video I actually thought it's always being controlled with the mouse - Back then I just couldn't imagine dodging the stuff with arrow keys.