Yeah, it makes sense it is not possible to do that in browser. In offline build I think it would also be cool if players could hold a button to look around with the mouse without changing their movement direction.
Second person dying after wave 3.. I wonder if the speed and flap power changes made it less intuitive..
I only had one human left, so I thought it was just my poor blood management. The game can be pretty random when it comes to where humans run away. In one playthrough you could just fly in circles and hit them, but on the other one they could be running back and forth which would require more strategic approach, so I wouldn't worry about balancing that given that is not going to be the main focus of the game (based on your comments below).