Let me explain. When you reach the "True End", the game have nothing more to tell/shows you.

It's anticlimatic? Yes, was the idea.

Now, if you are talking about see new secrets and make another choices, you should go to "game" folder and find this files "gameended.smor" (idk if thats the exact name) and "firstroute.smor". If you delete the first one, you will be on the "mdos computer" if you delete the two, the game will be reseted.

But, there's not a "Good" ending, if thats is what you're serching for.

Nothing can change the things you see on the True Ending.

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at least on this game.