It's a really cool concept and I especially like that the backtrack button having limited uses as a mechanic since it gives players some judgement calls as well as some breathing room as they traverse.
If you polish up the art by making the background feel more like a place based on reality (Streets, Buildings, Forests, Etc.) or have them be very creepy or weird (Yume Nikki, LSD, Silent Hill) the players could feel far more immersed when they explore. Also, when you "kill" the player, try to make their deaths feel more tangible by using some audio or visuals, instead of saying how they died.
In terms of mechanics, I think there are a few bugs when the "backtrack counter" doesn't refill, but otherwise with a bit of polish, love, and extra effort you can make potentially make a very unique and interesting interactive-story, horror-platformer.