There's no discord yet. It is planned if there will be enough interest, which so far I am measuring via a feedback form on FA. The progress is also present on FA but more recently here via patch notes. Discord would be more community driven or for easier communication if it will exist.
The gun can shot in any direction. It's clunky a little bit, but if as long as you press a single movement key before shooting, the direction will be set correctly.
Which goo wolf are you referring to in particular? I am confident all can be incapacittated, but I'll at least test this one out.
As for medkits, their use is specific to the form and while that will get rework, in case of the pooltoy you must rub 10 times before you can use a yellow medkit. And in case of the blue one you must be deflated to the state below the default. Some form of inflation display is planned for the future.
Thanks for playing!