Reminds me of an old Atari game Moon Rover I think was the name. Anyway, the game definitely is a good start. With more levels, variety of traps/enemies, and some improvements in the music and sound effects this could be a solid game. One major problem was if you were hit by the aliens on the second level you could not get off them. They'd drag you all the way back until you died. Maybe remove the alien that you were hit by so this doesn't happen.