I can't say I had any real control over where my arrows went (and firing them itself was an issue as well), using a PS3 controller with the webgl version.
It was kind of using the D-Pad up/down would fire them into a vertical direction and the right tumb-stick would fire them horizontally.
In a twin-stick mode I'd expect the second stick to determine direction and then shooting with one of the action buttons...
Cheers Heckert - yes it's definitely trickier compared to the mouse, even with a generous dead-zone for the right stick. I was thinking about how to add alt-fire on the right stick and indeed it'll need to be in combination with a trigger or button press. So I may switch the main fire to those controls too. I guess I was using Arcade / SNES Smash TV as a reference point for how to handle the shooting.
All that said I did find the thumbstick fire a lot more visceral and feeling like there was a bit more skill involved rather than just clicking.
