cool
its good, but its too repetitive. maybe some more alien type weapons instead of earth ones? or a story. or level variation.
say your mission is to get into the core of a volcano. you have to climb to the top of the volcano by using your gravi gun, then theres a bridge across the middle. then you use explosives to destroy the bridge and fall down into the core of the volcano where you can plant the bomb and escape.
more importantly, you need to change the level platforms. you made dubai, but dubai is famous for its amazing buildings, so put in buildings instead of a desert. its really boring if all of it is a flat area.
you know, a level editor would be nice for a game like this.