.. which is currently my fav game! Is Hedgewars
There’s a complete review written here, but in short : the gameplay is a lot like Worms Armegeddon, the sound effects are cool, and the controls are really intuative.
Plus the AI’s pretty good (dunno if that’s a good thing)
The other alternative is wormux which has a pretty good game engine, a lil more stable with lesser bugs, and nicer characters. But Hedgewars is without a doubt more addictive and more user-friendly and more intuative.
Plus hedgehogs are cute