Use the arrow keys or W A S D to move and press z to attack. You gain different upgrades as you defeat more enemies. Press the triangle in the corner to pause the game and adjust the settings. The star in the corner of an upgrade means it is an ability. Press space to use your ability. Getting an ability when you already have one replaces your current ability. The sword in the corner of an upgrade means it is an attack. Getting a new attack when you already have one
You have to press the flag two times to restart the game properly. I made everything in this game.