I think there was a bug, picked up ammo but i did't get any. Maybe add some granade launchers?

Just had a look at your game.

I feel that what there is, is a good starting point for something bigger.  I felt that the movement was a bit slow and I wasn't able to figure out how to replenish ammo meaning that when I ran out of ammo, all I could do was run around.

But all the core building blocks are there in my opinion, if you continue to work on it I would be happy to give it another look.