Use the arrow keys to move left and right, and use the up arrow key to jump. Press space to use big attack, which uses 2 energy, or press the down arrow to use big attack, which costs 20 energy. You have to be touching the enemy to use an attack, but if you are touching the enemy when they attack, they will do more damage.
Backdrops - Aiden Scratch cat and Dragon - Scratch Big Chungus - Gab-e Neon Tunnel and Boardwalk - Scr atch Mario's void - Google