The character’s mechanics are inspired by the railgunner from Risk of Rain 2. Both the railgunner and the protagonist of my game wields big, powerful gun while also having very high mobility.
As for the fact that the knock back from the weapon can knock you off platforms, it is a super intended part of the base mechanics. :p You can usually overcome the knock back force by simply moving in the opposite direction the force is pushing you. You still need to be careful, though.
As for the sound cues, the enemies do make a unique sound when they notice you. Prolly not enough, though.