Graphically I liked the way the world looked, but sometimes it was hard to navigate the levels, and find the keys you needed. The Aliens also seemed to block my way from getting keycards a number of times as they would just hover on the keycard.
I felt like the normal walking animation was a bit to slow for the speed you moved as well.
Regardless of my nitpicks which would easily be corrected given more time, the game is a fun take on the theme. Great Job!