Thanks for playing! And thanks for the feedback :D
Our intention with the camera controls was to make sure that the player could see where they were shooting & where they were running (to avoid just running into enemies or walls that were just off screen), but I agree that our implementation of this did mess with the aiming a bit :P
Those are new weapons! I think we did a poor job at communicating that though.
We had planned to add an on-screen prompt to tell the player that they can swap weapons by scrolling the mouse wheel (rather than just saying that in the project description), but didn't really have the time.