Thanks for playing my demo!
Curious what your specs are? The game is pretty lightweight, aside from the realtime lighting, so it should run pretty solidly on most rigs (400+ FPS on my rig which is pretty outdated)
Menus are probably going to completely change - they were thrown together at the last minute for Demo Day.
Automatic reloading is something I'm definitely going to add in (at least as an option), as it seems to be pretty highly touched on feedback.