It could definately use more levels... the spacing in between them was good though. I also thought that the free shield was sort of worthless because you can get them anywhere anyway. Just an idea, but maybe you could get money from the monsters and buy guns and acessories that can do different things. Hope this helped!
 "On the brink"){kind=icon}
 "Last Robot 2"){kind=icon}
 "Nightmare Runner"){kind=icon}