Nice job! The puzzle element is probably the biggest selling point here, and it doesn't disappoint. I remember seeing another puzzle game that uses a similar "projection" mechanic in the past, but I forget what the name of that game is. Anyway, the puzzles are cleverly designed and require a bit of thinking. It's a bit restrictive with how much the photo mechanic can do, but I guess with the current puzzles, it's more than enough. The graphic is also nice and charming, and there is a story too! Well done.
For some criticism, let's get the elephant in the room out of the way. Sound! You need sound to elevate the game, immerse the player! Without sound really hurts how the game feels. Another thing is that, using Z and C for photo manipulation, WASD for movement and E for interaction in my opinion is a terrible idea. Making everything controlled by a single hand is ultra hard and induces unnecessary difficulty. Holding Z for placing, while moving it to the left with A is almost impossible without some deliberate gesture. Given that you are not even using the mouse, please let our right hand do something instead. I will also say I am not a fan of the final combat. For me battle in a puzzle game should always centre around the puzzle mechanics. Your buzzsaw and box level is a good example for this (focusing on testing the player on how to use C smartly). But with the final boss, it turns into an action game without any use of the photo mechanics, and it felt quite out of place.
Anyway, with all that said, this is a game well done! Seeing you are going for a Steam release, I wish you the best of luck!