The levels play and feel the same as the first contact game, in fact, they are the same. The only difference between both games is a wider screen and the option to go fullscreen. There is no difference in the game whether you take the hidden checkpoints or not and those are not hidden very well. Also, I don't understand why you put the ZQSD as the default controls when you know that you're going to upload your game on a site where most of users have QWERTY keyboards, it's silly and sincerely, a waste of time.