It is not a casual game so it may not appeal to everyone. Wilds.io has been out for around a year - in that time it has been balanced and improved with the help of its harsh community. It takes a while to get the controls right but here is a basic strategy:
Use shield (scroll down) to block an incoming attack - opponent that hits your shield will get stunned and will be open for a counter attack. You can break a shield with roll (scroll up) - and also defend against the roll by using kick (right click).
Travel around the map with WSAD, hold the right mouse button to run - jump with SPACE and if you don't like the controls at all just redefine them in settings menu.
If you want to go deeper into the world of Wilds google for wilds.io wiki and wilds.io userecho where I consult the direction of the game with players.