Expendable won't win many prizes for story but it's a fun frenetic shooting game with simply gorgeous graphics when you put the settings to max - the term "eye candy" springs to mind when you're confronted by its explosions of particle finery. Although the 3d perspective is more 2d and the models and environment don't stand up so much, it still looks amazingly good on today's systems.
I won't buy this on here as I already own the big box version, but if you've never heard of it I heartily recommend giving it a go(g).

I remember playing the demo way back in the day. I'll definitely have to check it out!

so is this game something from the ikari warriors mold, or something else? what can i compare it to?

Yeah, gameplay is pretty similar.

Each player has different keys on the keyboard.

Sounds like Shadowgrounds to me. If it is, I can see this as being a purchase.

Like Shadowgrounds, but a much faster pace.