Level Select:
Hold Ctrl + T during game play. Alternatively, hold Ctrl + Alt and type qwerty during game play.

Level Skip:
Begin game play and press F until the screen flips upside-down. Type I think therefore i am.
Press C to jump to the next level. 

Unlimited t=Time:
Type SAGGITARIANS MAKE BETTER LOVERS. 

Level - Password 

     144 - GVXQ 
     145 - TONY 
     146 - JHEN 
     147 - COZA 
     148 - RGSK 
     149 - DIGW 

Note: Passwords correspond to the final level and five bonus levels.