Thank you for playing my game! This is actually a scrapped Beta version, not a fully tested and bug-free product. You can pick up weapons by just walking over enemy corpses (classic in action). I made this game on very first (2005) version of FPS Creator, which is VERY buggy. There are no melee weapons. The key for saving ammo is shooting an enemy at close range (another FPSC problem with it's "realistic ballistics"). And by the way, I am just a history teacher, not a professional programmer, so my games are quite glitchy and sometimes untested.
PS. This game was partially made by a 18 year-old girl (my sister).
Your A. I. S.