How to make multiplayer game???With players???Tell me
Even though you COULD have multiple players. You can’t have multiple players on multiple computers.
Just make a carbon copy of the original player but change its keys.
Player with arrow keys
Player with WASD
done 
you sadly cant make it multiplayer, like 2 phones or computers
but as Latif3 says above me, You can use WASD and the arrows keys! Have your friend come on the same laptop or computer and you can use the same game together!