The only twin stick shooter I recall ever playing is 'Enter the Gungeon' which plays better with M+KB as you can aim way faster with the mouse than with an axis stick, I'd assume it's the same with 'Nine Parchments'.

You will want to play it with KB+M. The aiming on a controller is poorly implemented, since you can only shoot at 45 degree angles, whereas with the mouse you can shoot wherever you're pointing to.

I gave up on playing it in couch co-op as I was constantly dying on the controller and obviously you can't play it with dual KB+M.

Oh and the checkpoint system is poorly done as well - I remember we had to replay a level over and over because the same boss kept killing us, but of course we did not instantly respawn close to the boss fight, but way over at the start of the level, 2 minutes away of just walking and collecting stuff from the boss.

The frustration is strong with this one. I am disappointed by the poor design choices since I am a fan of the Trine series. Well, of the first two games at least.

Thanks for the clarification. Guess this one stays on the 'avoid' list for now.

Ahem.

Allow me to clarify.

Actually, no. I guess it's better to just demonstrate: https://www.youtube.com/watch?v=wX1Jl_TYY3Y

In this video you'll see a guy playing a TSS in a tablet. So you can be certain it's not mandatory to use a controller.
I could say a bit of stuff, but really you'll figure it all out in ten seconds this way, including why this genre is called a twin-stick shooter and why M+KB is a perfectly adequate controlling method when playing in a computer.

I'm loving the continued support, just like I love this game. Thank you for the update guys.