The gun is just sprites. Looks like I fooled you! :)
Mouse control is on the cards. Not sure about looking up and down, but if so, it'll be with shearing.
Yeah XD. You got me. Hahaha! What I greatly enjoyed in Quake back in the day, was a lot of the verticality. It was the first game where people permanently had mouselook enabled (initially it required entering +mouselook into the console). I have no idea how smooth this all plays, but I imagine a tiny, simple deathmatch bot could be great fun. Or even having two, and a spectator mode with external cameras that take any vertex in the game that's able to capture the action... or from their perspective. And you can just watch the show if you don't join. :3
I'm a dreamer, I know. :3 Just throwing in ideas. The base game is already great fun. No idea why I never suggested a bot in the DOOM version, but now I would. Even if it meant having a seperate program just for that kind of gameplay. Cooperative play with a bot would surely be too complex though.