Dude, I got it loud and clear - you're non-developer, who just made a game for his kids in spare time as a hobby. My expectations won't spill out of that ballpark, don't worry about that.
I successfully added your game in my Steam ecosystem locally, but when I tried to map my own controls on gamepad through Steam Input, something really weird happened - the game partially tried to recognize my Sony DualSense as an Xbox controller for some reason. So it mixed my bindings with what was originally intended, but not for every button, only for some of them, so some buttons triggered double inputs at once XD It was a mess, but very funny, like I was playing slapstick comedy featuring Leslie Nielsen trying to fight various infected creatures. However, when I turned Steam Input off, it didn't recognize that my gamepad was connected.
I think I know a potential solution for this, it will require a third-party software called DSX and slightly more time. This software tricks your PC into thinking that your gamepad is a different kind of gamepad, including translation of Sony inputs into Xbox inputs. I'll try it next time and will report how it went.
I kinda have a feedback on the game itself, but I want to play it more to really have something of value to say, and it requires getting controls out of the way first.