Very cool idea, it's especially satisfying to see the monster bounce around. I would say to either choose mouse controls or keyboard controls for player movement since it's a bit frustrating to constantly switch between them. I would use left click to stop for player movement, so that way all of player movement can be controlled using the mouse. I also would make the camera follow the player, and not be controlled seperately. Other than those issues that need to be tweaked this is a really cool concept! The sound effects when the player ate one of the astronauts was especially funny.