It's a version of the Arcade Classic from the 1980s. Shoot various creepy crawlies as they attack you. Please note the graphics are supposed to look like this, it is a port of the Atari 2600/VCS version of the game. Source is available at myconstruct2dev.blogspot.co.uk and is useful for anyone who wants to know how to make "Snake" games, as the centipede movement is not dissimilar.