Found one of my older games that I dont have the project files for

Hello, I have made numerous small projects for myself to learn the ins and outs of the engine. I spent a lot of time on one project where you walk around a house and the house warps as you get further in. I lost the project about two months ago but recently while trying to find the files for a Website I was working on for a friend, I stumbled upon a folder named “WalkHouseScary” (what a clever name) and found the game extracted into an EXE file. The only problem is I still had a lot of work left to do, and the lighting wasn’t even built properly, Is there any way at all to edit this?

EDIT: I would be fine with only being able to just rebuild the lighting, but I probably worked on this for a month and a half (remember it was a side project for me to learn procedural generation and architecture), Also in advance, Cheers :D!

Short answer: Nope.
Its not possible to reverse engineer the project out of the cooked/compiled game.