Use arrow keys to move and click space to slash sword. Using your sword takes 0 energy and has a little knockback. Hold space until the sword is blue for the dash move. If you click you will push all enemies away from you and temporarily stun them. Dashing and Wind Attack take energy which takes a while to regenerate so use them wisely. Orange enemies are the basic enemy, blue ones are fast but low health, red ones are slow but have high health, and grey ones have low health, don't move and fire lasers at you.
You may have to double click the green flag for it to work