Thanks for the feedback!
A huge update is coming out next month. Be aware that it will wipe old saves (I promise it will be worth it).
I'll see if I can get auto-saves into that build, but either way it's definitely coming in a later version of the game. I'm also working on a hover feature so you can move around more easily, kind of like in Sandustry. Love the idea of input/output automatic box, basically like a buffer chest is how I read that. You're not the first person to suggest it. The game needs it.
email it to tedbendixson@me.com, and I'll see what I can do for you. It might not have everything in it, but there's a decent chance I can get it to a playable state. Are you on Windows or MacOS? On Windows, the save files are located in AppData/Roaming/CaveFactory. On MacOS, they're in the application support directory.
I'm not sure how to recover web build saves, but I can see if there's an option for you.