Password for 2nd part is: HI SCORE

SOLUTION [for 2nd part]
The first thing you've to do is avoid the green monster that is jumping at the first screen. You have two ways: (1) to run (keeping pressed right key) and jump -recommended- and (2) Jump to the left -you hit spaceship and bounce- and if you're lucky you can avoid it safely. The soldier on that screen can be a problem when he decides to shoot. Move fast to the right.
In this screen and the next one you've to kill a monster that appears and dissappears when it wants. You'll have to kill it using sausages or you won't be able to advance in the game [it needs one hit].
In next screen kill the soldier (you'll need 3-4 hits), get the sausage and go up -time to fly -. Right(x2). Get the sausage and up (there's a vent at top-right corner of screen). You reach one screen with two computers. The door opens when left & right monitors show Earth. After this, you'll have to move 3 screens to the right (it'll be safer of you do this flying) and you've completed this game.