WASD to move, click to stab with your sword, and your sword will always be pointing towards the mouse. You can hide in the safe bubble and you cant be hurt, but you cant kill enemies either. A safe bubble will appear for only 15 seconds before moving to a different spot. You can use money to buy upgrades to damage, speed, and health.
Credit to the game Castle Crashers for the awesome music. <><><><><><><><><><CHANGELOG><><><><><><><><><><>< 5/19/2017: Shared!