Yeah one of the first things I'm changing is locking the camera to the gun's sights while aiming. I thought the wobble would make it feel more like firing a gun in real life, but it ends up making shooting less fun. I also might take away the "Bandage Your Wounds" option between waves and make health automatically recover instead, so you can get more ammo without sacrificing healing. The ammo on a timer is a good idea too, so I'll test that out as well. The AI was the hardest part of this project for me because I've never used Unreal Engine's behavior trees before, but I'll definitely work more on making enemies smarter and making combat feel fair.
Thanks for giving my game a try! And thank you for the feedback, it'll help me make more improvements now that I don't have a time limit to worry about :D