press green flag to start. when menu appears, press y to select boss and click on the button to start the battle. use left and right arrow keys to move left and right, respectively, and use up arrow to jump. use down arrow to attack. when you run out of hp, you lose. when the boss runs out of hp, you win.
btw Optic is a work-in-progress Please comment your favourite boss and why, which boss is easiest/hardest, any bugs, and also suggest ideas for future updates (e.g. new bosses). Personally, I like them all but Tikki is definitely the hardest! Pyramidian is both cutest and easiest. New bosses coming soon! Version 1.2 Update History: 1.0 game shared 1.1 bug fix - can't go below a certain height 1.2 Tikki is finished! 1.3 bug fix - you lose even when your hp is in negatives