Decent gameplay. So-so sound fx. Terrible graphics.
I think the weapon switching takes a little too long. But the rest of the single player gameplay was ok.
I tried the 2-player option by myself (aren't I pathetic not to have someone to play with?). The controls take getting used to. It might be better to allow players to configure their own controls. I like the powerup system.
I think sound fx need some work. Definitely needs some music on intro, menu, and stage select screens.
Graphics should be improved overall, but if you had to focus on one thing, better graphics for the soldiers would improve the look of this game a lot.