Cool idea for a game and the story reminded me a lot of OneShot. Unfortunately I really struggled with being able to see anything really in some parts, especially with the blue flame and some puzzles didn’t feel very intuitive like the parts with the light eating souls. It sometimes felt more like I was being lucky that they weren’t were I was going at the moment when you couldn’t see them yet (like in the 2nd level) or like I could only pass after I broke them by squishing them with a box or elevator, making them completely trapped.
after finally beating the 3rd level, or at least reaching the last torch there, the game soft locked for me in where it wouldn’t lower the door enough for me to exit :(
Eitherway, this is a neat game for the first time and having some more “advanced” settings was pretty cool too! A bit more visibility would have helped a lot with my personal enjoyment, which, if you don’t want to add it to the main game directly, you could add as an accessibility feature in the options or instead of using “full blue”, you could go for a brighter color and / or tint of blue like cyan.