The instruction bubble on your mouse will tell you what the selections do in the menu and when selecting characters. For P1, use arrow keys. For P2, use WASD. The objective is simple: Try to beat the other player using your powers. There are power ups. The heart power up gives you 50 extra health. The optical power up gives you a power you can only get if you get the power up. "S" and down arrow key to use your main ability. Have fun!
2/22/26 I started working on this. It took a long time to make and is only in the beta version. It will be updated.