Very fun and promising game!
Unfortunately, I only discovered that the mouse was the camera rotation after playing for a while. =D
I thought it was a keyboard-only game (ASDW + Space).
The information about the mouse could be on the game control explanation screen, like it is before the game starts, or in a more intuitive way, the arrow keys on the keyboard could be the camera and the ASDW could be the character's movement.