Farming and fighting share the same island in Yenemy. This io game mixes hardcore survival with player-versus-player combat: you gather resources, craft and build, look after a farm, and defend it all against other players in large-scale battles while working on long-term progress across the island.
WASD or the arrows move you, Space jumps or dashes, and the left mouse button attacks or gathers; the right button switches to automatic attacks. R opens crafting, B building and K your skills. Gather and build first, then pick fights. For a simpler arena where you just grow and survive, Wormate io is here too.