Because it's a ton of work to add it, I have to feed my family and this is a free game we made for a game jam 😁
I investigated this before but there is no feasible way to add a save feature in a reasonable amount of time. We appreciate all the love Ravenhaul has been getting and we love it just as much. I expect we'll revisit it eventually, expand it and also add a savegame feature - for a commercial release.