I like a good puzzle game, I couldn't get them to die together, was a bit hard to figure out the reverse thing. I think for the first level you could have character 2 moving opposite direction every time you move character 1, then level two could just be the same character and environment but adding the time difference thing. This would allow player to get a feeling for the game first then be challenged in a harder level. Good concept, I hope you carry on developing the concept. Well done for the entry