Wow, this is a complete game basically.
I had major gripes with it thoug, everything is the same drab color, enemies don't stand out from the background at all, for the exception of those yellow alien things.
Even mines look less threatning than the traffic cones, in the game where so much is happening, it's a crime not being able to tell where the danger comes from.
Easy is not that different from normal, it only got noticable near the end of the level.