Sorry about that. I didn't playtest with a trackpad, might be a bug I have to iron out. If you can, give it a try with a mouse or a controller, hopefully should work then! Regardless, thanks for giving it a try :)
I dug into it, and found the problem! The aim angle was defaulting to 0 every frame unless there was mouse input that frame. Thanks for confirming you were seeing the issue too, I've patched it now, so hopefully it's a better experience!