I love the art style and the idea is cool.
We used very similar mechanic in our game. I even ran into problems in my game that I also see in yours (see screenshot)
2 tips I can give you:
1) You can use simmer.io tools, so that the resolution of the game don't make things get cut off on the sides
https://blog.simmer.io/responsive-webgl-template-free-in-the-unity-asset-store/
2) Point light is a bit buggy in unity, and you see little black lines sometimes. If you use the other 2D light this doesn't happen
I still liked it, and using the puzzle to keep the payer focused on the story is very smart.
