BUGS! was a fun little wargame by Two Hour Wargames back in the day. It used their reaction system (see Chain Reaction) and individual hit points for the characters as well as the bugs. The bugs appeared from holes in the ground, which opened randomly but then poured out bug after bug, until closed by dropping a grenade in and collapsing the hole. With that, the game recreates the typical "small heroes against unending waves of bugs" setting.