Wow, what a complex game you've made! Puzzles are hard enough. The design is pretty, the little details such as toolboxes and piles of rubble are adding so much to the feeling of abandonment. The music reminded me of Va-11 Hall-A a little.
But the WASD movement in isometric space confused me a little :( And one more thing, it was a little annoying that Photon was moving one step at a time.
Overall, I really liked your game, it's great!