Hi,
This is a really creative and interesting idea. I enjoyed playing it and the boss battle at the end was quite creative. Good job!
I found the game to be very polished and I did not encounter any bugs or issues. The art style is very crisp and detailed and that adds to the polished feel of the game. The only thing that I would mention about the art style is the transparent doors that can be enabled/disabled with the switches. I think it would be good if you replaced them with a sprite or something that fits in with the scene rather than just a coloured rectangle but apart from that the art style is really good!
The puzzle mechanics have a lot of potential as you develop the game further and add more levels. Perhaps you could add clones with different properties such as clones that move in the opposite direction or clones that could be damaged just like the player. This would add more variety to the puzzle possibilities, and it would expand the gameplay.
Hope you find this useful, If you have any questions please ask!