Amazing game! The platforming and exploration is all great, the enemies are really dang well designed, and the different areas are all so unique and strange! Each of the bosses were really well made (and, in Marathon, Night and Nemesis's cases, difficult) - and the moment where you see Zippi as a regular enemy in the Void (what I call the white area) is GREAT. The escape sequence is a bit frustrating and stressful, but it doesn't hold down the game too much. Tl;dr: very goog game.