I've been looking for this old game for a long time. It was some kind of a snake/worm game, you could buy weapons before rounds (maybe, but you could use weapons) and it had 4 player multiplayer (or with cpu, anyway max 4 players). Also you could only move in 4 ways. There were also some sort of mines and maybe exploding barrels scattered in the levels/arenas. And it was from a top down perspective.