So I Made A Project https://scratch.mit.edu/projects/81578288/#player And I Wanted It So When It Game Over You Can Press Left To Go Back To menu But It Messed Up If yOU hELP Help You Will Be Given A Follow And A Comment And Love And Fave On Three Of Your Projects Make I 5 acually thx

You need to re-work the game so that you have properly named events like

when I receive [Game Starts v]

and

when I receive [Show Menu v]

instead of relying on

when [space v] key pressed

and

when green flag clicked

Do that and things will be much easier.

Pretty sure I fixed it: https://scratch.mit.edu/projects/82352142
I also changed “message 8” to “Main Menu” (otherwise, it's really confusing). Tell me if there's anything else that you need.
Also, If I were you, I'd take @drmcw's advice and make my scripts “proper”. Maybe start by renaming all the messages?
(You also have blank sprites in your project for some reason; I deleted them.)
The biggest problem is that on your stage, you have:

when [left arrow v] key pressed
stop [all v]

It stops the game immediately after it restarts. There were also some other problems with starting positions and objects not showing/hiding here and there, which I all fixed.