Its a very fun game but when i got 20/20 on all my saves i could not ply
I'm glad you like it!
For any save slot, you can rewrite it by selecting a new game in that slot. So to overwrite the "20/20" in slot 1, solve the maze under the main menu and start a new game in slot 1. This will overwrite the game in slot 1 to "0/20".