I like your concept. Its silly, its horror (not usually my cup of tea), but in a wacky scenario. Especially Ronald McDonald lol.
I dabbled in Unreal Engine 5 a few short weeks ago and realized how much of a learning curve it has. Its complex, but its so powerful. All these options that just overwhelmed me for this jam. I jumped over to Unity and felt the same.
If you gave yourself three full months, you can have this game made. Probably.
Good luck. :D
-Matthew