Draw with the mouse while holding down the spacebar. The smiley face can interact with drawn lines. Change the smiley's color by clicking him. Please never click the eraser, though. I repeat... DON'T CLICK THE ERASER. Pick up the eraser safely by holding down E. If you want to blank the whole screen, double click the green flag. P lets you input a password. More cool features in progress.
Sounds used are from Undertale, a game created by Toby Fox. The song that plays in the background is "Digital Battle", composed by Shad and Toby. The password isn't mongolian cheese.