Corrupted Build?

Whelp. I'm stumped. (tdlr every script even from multiple sources in the asset store all say that the associated script cannot be loaded now)

I was working on a project on the title screen. I had it working, but I tried to add a fade out effect when the new game button was clicked, to make the level transitions a bit smoother. I was following a youtube how to, but it wasn't quite set up for what I wanted so I took a crack at some custom coding (which is far from my strong suit) but it didn't work. I was getting console errors. No biggie, I deleted the script and reapplied my original working one just as it had been. Only now it said that the script had inconsistent language and couldn't launch despite it working just fine 15 minutes ago. All right, that's weird. I deleted that script, at least it was only a few lines. Now the project won't play at all or give console errors and every single script regardless of whether I wrote it or it came from multiple different asset store sources all say that the associated script cannot be loaded. In every scene, not just the title scene. 50-100ish scripts.

Is there some kind of terrible checkbox that shouldn't exist that I accidentally clicked on somewhere? Or is this build unsalvageable and I just need to move my assets to a "new" project and rebuild it? Any thoughts or suggestions would be swell, I was about two days away from launching a test build for a group of people. I'll only lose a day or two if I have to move stuff over, but it'll be a very rage inducing day or two.