Very good level
It has sme good rocks and other assets.

Somepossible improvments :

- use less bright sand and rock texture on floor, or decrease a little global ligtening ? Perhaps it's a shiny level full of sun ?

- already said : put a cross air

- Shot gun, don't work

- Make a flash on ennemy weapon when they shoot at you
(it's hard to see what ennemy is shooting)

- Make a screen effect when the ennemy hit you
(Hard to see directly when you are hit, we don't
have time to read Health points in the rush of the action )

- Make the game lot more friendly : Ennemy should not shoot
you right all the time like a robot
Sometimes he oculd miss you, or damage you less

- Ennemy should stop shooting some times to reaload or go to a safer point ?

- Some ennemies would only begin shooting when you are near enough and won't begin shoot until you begin to shoot at them !

- Make some system to regain health :
Health pack, or health regeneration like Call Of Duty for example when you are not hit or when you are hidden after some time.

Well it's just ideas, to make your game lot more friendly and playable without diying each time
After that you can make some Hard Core mode without health
packs or anything else !

Keep up the good work !