Nice start Seriall.
I know this depends on your type of keyboard (Azerty or Qwerty), but i dont find it comfortable to use the arrow keys (with left hand) and the mouse. All FPS games use AWSD for movement.
If you are trying to cater for both styles of keyboard though, i have no suggestion for better controls.
@Velojet - haha it was fast, by the time i pressed spacebar then got my hand on the movement controls they were already on me!
Good first game - something you should keep building imo.