Also I was hard time rotating camera - rotation only worked when I was alt-tab to another window, and game window was in the background. So for the most of the time I was adjusting camera, then alt-tabing back to game and try to progress with that fixed camera angle :D
However I was playing on VMWare Workstation + Ubuntu, so it could be more of a bug with virtualization and how it handles mouse input. Or maybe it's just a problem with Unity player on Ubuntu or something like that.
Despite that I was determined enough and was able to finish whole alpha version, so there's that. ^^