You can add a y movement but this is just for games that i may make or you may make in the future. If you remix please credit me this took so long. The faster you run into him the harder you hit.
I made this by myself so i dont have anyone to credit but i do not recommend to add more than one enemy sprite at a time. I will probably make a 1v1 game and add more features but for right now this is what i have.