Simple items

Rocket, mortar, mg, shotgun, and electro are fine. Everything else either doesn't appear as if it will scale well, or just plain needs to be redesigned. The armor/health designs in particular are complete eyesores to me. Hagar and Crylink consist of small icons to barely fill the space. They're small already, and as is, they will likely be difficult to spot easily. Try to fill up the space with a single definitive design, even if multiple does say "rapid fire" well. The nex icon, plain and simple, won't show up well. It may as well just be a blue line, because the particles around it will be too hard to see. MG ammo looks too similar to shotgun. Shotgun ammo should probably have something that sets it apart from the weapon itself other than a 1 pixel border. Rocket ammo is fine. I'm not in love with energy filler icon, but it works.

If I have time I'll draw up some concepts for armor/health, but I'm already working on a project for another game, so we'll see.

P.S. I hope you guys aren't drawing these up as a raster images.