S key is to pause, F key is to unpause 1 is to shoot the flying spider/bat which will work on the boss, equals is for fullscreen. Arrow keys to move around. Running into the hearts floating around the screen restores health. Collect 10 chests to advance to a new level. There are several buttons hidden on the level one map. Find them all to activate a secret! You will need to use the mouse and click around! Collect 100 coins to get full health back.